### Install radioactivedecay from source

Source: https://radioactivedecay.github.io/installation.html

Install the package in editable mode from a local clone of the repository.

```bash
$ pip install -e .
```

--------------------------------

### Install radioactivedecay

Source: https://radioactivedecay.github.io/_sources/overview.rst.txt

Installation commands for the package using pip or conda.

```bash
$ pip install radioactivedecay
```

```bash
$ conda install -c conda-forge radioactivedecay
```

--------------------------------

### Run tests for radioactivedecay

Source: https://radioactivedecay.github.io/installation.html

Execute the unittest framework to verify the installation.

```bash
$ cd radioactivedecay
$ python -m unittest discover
```

--------------------------------

### Initialize InventoryHP instances

Source: https://radioactivedecay.github.io/inventory.html

Examples of creating InventoryHP objects with different nuclide inputs and units.

```python
>>> rd.InventoryHP({'Tc-99m': 2.3, 'I-123': 5.8}, 'Bq')
InventoryHP activities: {'I-123': 2.3, 'Tc-99m': 5.8}, decay dataset: icrp107
>>> H3 = rd.Nuclide('H-3')
>>> rd.InventoryHP({H3: 3.0} 'Bq')
InventoryHP activities: {'H-3': 3.0}, decay dataset: icrp107
>>> rd.InventoryHP({'U-238': 21.1, 'Co-57': 7.2}, 'Ci')
InventoryHP activities: {'Co-57': 7.2, 'U-238': 21.1}, decay dataset: icrp107
```

--------------------------------

### Install radioactivedecay via pip

Source: https://radioactivedecay.github.io/installation.html

Use this command to install the package and its dependencies from the Python Package Index.

```bash
$ pip install radioactivedecay
```

--------------------------------

### Perform basic decay calculation

Source: https://radioactivedecay.github.io/_sources/overview.rst.txt

Example of creating an inventory and calculating decay over time.

```python3
>>> import radioactivedecay as rd
>>> inv_t0 = rd.Inventory({'H-3': 10.0}, 'Bq')
>>> inv_t1 = inv_t0.decay(12.32, 'y')
>>> inv_t1.activities()
{'H-3': 5.0}
```

--------------------------------

### Install radioactivedecay via conda

Source: https://radioactivedecay.github.io/installation.html

Use this command to install the package from the conda-forge channel.

```bash
$ conda install -c conda-forge radioactivedecay
```

--------------------------------

### CSV file format example

Source: https://radioactivedecay.github.io/fileio.html

A valid CSV file structure with nuclide strings and quantities.

```text
H-3,1.0
C-14,2.0
```

--------------------------------

### Reading inventory from CSV

Source: https://radioactivedecay.github.io/_sources/tutorial.rst.txt

Load inventory data from a CSV file. The example shows the file format and the command to read it.

```text
nuclide|amount|units
C-14|5.0|Ci
H-3|0.2|g
He-3|1|mol
```

```python3
>>> inv = rd.read_csv('example_file.csv', delimiter='|', skip_rows=1)
```

--------------------------------

### Calculate decay with mass and mole units

Source: https://radioactivedecay.github.io/_sources/overview.rst.txt

Examples of using different units for inventory decay calculations.

```python3
>>> inv_mass_t0 = rd.Inventory({'H-3': 3.2}, 'g')
>>> inv_mass_t1 = inv_mass_t0.decay(12.32, 'y')
>>> inv_mass_t1.masses('g')
{'H-3': 1.6000000000000003, 'He-3': 1.5999894116584246}

>>> inv_mol_t0 = rd.Inventory({'C-14': 1.0}, 'mol')
>>> inv_mol_t1 = inv_mol_t0.decay(3000.0, 'y')
>>> inv_mol_t1.moles('mol')
{'C-14': 0.6943255713073281, 'N-14': 0.3056744286926719}
>>> inv_mol_t1.numbers()
{'C-14': 4.181326323680147e+23, 'N-14': 1.840814436319853e+23}
>>> inv_mol_t1.mole_fractions()
{'C-14': 0.6943255713073281, 'N-14': 0.3056744286926719}
```

--------------------------------

### Retrieving branching fractions

Source: https://radioactivedecay.github.io/nuclide.html

Getting the branching fractions to direct progeny.

```python
>>> K40 = rd.Nuclide('K-40')
>>> K40.branching_fractions()
[0.8914, 0.1086]
```

--------------------------------

### TSV file format example

Source: https://radioactivedecay.github.io/fileio.html

A valid TSV file structure including units in the third column.

```text
H-3 3.0 Bq
He-3    17.0   mol
C-14    5.0 Ci
```

--------------------------------

### Uninstall radioactivedecay

Source: https://radioactivedecay.github.io/installation.html

Remove the package using either pip or conda depending on the original installation method.

```bash
$ pip uninstall radioactivedecay
```

```bash
$ conda uninstall radioactivedecay
```

--------------------------------

### Initializing inventories with different units

Source: https://radioactivedecay.github.io/_sources/tutorial.rst.txt

Demonstrates initializing inventories using default activity units (Bq) or explicit atom counts ('num').

```python3
# initialize an inventory using activities:
>>> inv = rd.Inventory({'C-14': 5.0, 'H-3': 2.0})
>>> inv.activities('Bq')
{'C-14': 5.0, 'H-3': 2.0}
>>> inv.numbers()
{'C-14': 1297520091697.4946, 'H-3': 1121785791.5588164}

# initialize an inventory using number of atoms:
>>> inv = rd.Inventory({'U-238': 2000.0, 'U-235': 3000.0, 'U-234': 1500.0}, 'num')
>>> inv.activities('Bq')
{'U-234': 1.3420556696283726e-10, 'U-235': 9.360075764027427e-14, 'U-238': 9.832129719300668e-15}
>>> inv.numbers()
{'U-234': 1500.0, 'U-235': 3000.0, 'U-238': 2000.0}
```

--------------------------------

### Initializing Inventory Instances

Source: https://radioactivedecay.github.io/inventory.html

Create Inventory objects using different input formats like nuclide strings, Nuclide objects, or canonical IDs with various units.

```python
>>> rd.Inventory({'Tc-99m': 2.3, 'I-123': 5.8}, 'Bq')
Inventory activities (Bq): {'I-123': 2.3, 'Tc-99m': 5.8}, decay dataset: icrp107_ame2020_nubase2020
>>> H3 = rd.Nuclide('H-3')
>>> rd.Inventory({H3: 3.0}, 'g')
Inventory activities (Bq): {'H-3': 1067957043281807.0}, decay dataset: icrp107_ame2020_nubase2020
>>> rd.Inventory({270570000: 7.2, 922380000: 21.1}, 'Ci')
Inventory activities (Bq): {'Co-57': 266400000000.0, 'U-238': 780700000000.0001}, decay dataset: icrp107_ame2020_nubase2020
```

--------------------------------

### Retrieve Canonical ID

Source: https://radioactivedecay.github.io/_sources/tutorial.rst.txt

Get the canonical zzzaaammmm format ID for a nuclide.

```python3
>>> nuc = rd.Nuclide('Co-58m')
>>> nuc.id
270580001
```

--------------------------------

### Retrieving decay modes

Source: https://radioactivedecay.github.io/nuclide.html

Getting the decay mode labels defined in the dataset.

```python
>>> K40 = rd.Nuclide('K-40')
>>> K40.decay_modes()
['β-', 'β+ & EC']
```

--------------------------------

### Creating a nuclide inventory

Source: https://radioactivedecay.github.io/_sources/tutorial.rst.txt

Initialize an inventory of nuclides specifying the amount and unit type.

```python3
>>> inv_t0 = rd.Inventory({'U-238': 99.274, 'U-235': 0.720, 'U-234': 0.005}, 'mol')
```

--------------------------------

### Specify Nuclides via Multiple Formats

Source: https://radioactivedecay.github.io/_sources/tutorial.rst.txt

Demonstrates equivalent ways to specify nuclides, including string formats and canonical IDs.

```python
>>> inv = rd.Inventory({'Rn-222': 1.0})
>>> inv = rd.Inventory({'Rn222': 1.0})
>>> inv = rd.Inventory({'222Rn': 1.0})
>>> inv = rd.Inventory({862220000: 1.0})
```

--------------------------------

### Initializing Nuclide instances

Source: https://radioactivedecay.github.io/nuclide.html

Constructing Nuclide objects using various string formats or canonical IDs.

```python
>>> rd.Nuclide('K-40')
Nuclide: K-40, decay dataset: icrp107_ame2020_nubase2020
>>> rd.Nuclide('K40')
Nuclide: K-40, decay dataset: icrp107_ame2020_nubase2020
>>> rd.Nuclide(190400000)
Nuclide: K-40, decay dataset: icrp107_ame2020_nubase2020
>>> rd.Nuclide(280560001)
Nuclide: Ni-56m, decay dataset: icrp107_ame2020_nubase2020
```

--------------------------------

### Importing the radioactivedecay package

Source: https://radioactivedecay.github.io/api.html

Standard import convention used throughout the documentation.

```python
>>> import radioactivedecay as rd
```

--------------------------------

### Clone the radioactivedecay repository

Source: https://radioactivedecay.github.io/installation.html

Download the source code from GitHub to access the test suite.

```bash
$ git clone https://github.com/radioactivedecay/radioactivedecay.git
```

--------------------------------

### Inspecting inventory contents

Source: https://radioactivedecay.github.io/_sources/tutorial.rst.txt

Retrieve inventory data in various units such as activities, masses, moles, and atom counts.

```python3
>>> inv_t0.activities('MBq')
{'U-234': 269.4016050086039, 'U-235': 13.528246506057048, 'U-238': 293.90300567125}
>>> inv_t0.nuclides
['U-234', 'U-235', 'U-238']
>>> inv_t0.numbers()
{'U-234': 3.01107038e+21, 'U-235': 4.3359413471999995e+23, 'U-238': 5.9784200180824e+25}
>>> inv_t0.masses('g')
{'U-234': 1.17020475148, 'U-235': 169.23162824424, 'U-238': 23632.253822284463}
>>> inv_t0.mass_fractions()
{'U-234': 4.916278117985593e-05, 'U-235': 0.007109779290811992, 'U-238': 0.992841057928008}
>>> inv_t0.moles()
{'U-234': 0.005, 'U-235': 0.72, 'U-238': 99.274}
>>> inv_t0.mole_fractions()
{'U-234': 5.000050000500006e-05, 'U-235': 0.0072000720007200075, 'U-238': 0.992749927499275}
>>> inv_t0
Inventory activities (Bq): {'U-234': 269401605.0086039, 'U-235': 13528246.506057048, 'U-238': 293903005.67125}, decay dataset: icrp107_ame2020_nubase2020
```

--------------------------------

### build_nuclide_string(Z, A, meta_state='')

Source: https://radioactivedecay.github.io/utils.html

Builds a nuclide string from given atomic mass and number.

```APIDOC
## build_nuclide_string(Z, A, meta_state='')

### Description
Builds a nuclide string from given atomic mass and number.

### Parameters
- **Z** (int) - Required - Atomic number.
- **A** (int) - Required - Atomic mass.
- **meta_state** (str) - Optional - Metastable state indicator character.

### Returns
- (str) - Nuclide string built in symbol - mass number format.
```

--------------------------------

### add

Source: https://radioactivedecay.github.io/inventory.html

Adds quantities to the existing inventory.

```APIDOC
## add(add_contents, units='Bq')

### Description
Updates the inventory by adding the specified quantities of nuclides.

### Parameters
- **add_contents** (dict) - Required - Dictionary of nuclides and quantities to add.
- **units** (str) - Optional - Units of the values being added. Default is 'Bq'.
```

--------------------------------

### InventoryHP Constructor

Source: https://radioactivedecay.github.io/inventory.html

Initializes a new InventoryHP instance with a dictionary of nuclides and their quantities.

```APIDOC
## InventoryHP(contents, units='Bq', check=True, decay_data=None)

### Description
Creates an instance of an inventory using high-precision arithmetic for radioactive decay calculations.

### Parameters
- **contents** (dict) - Required - Dictionary of nuclides (strings/objects) and their quantities.
- **units** (str) - Optional - Units of the values (e.g., 'Bq', 'Ci', 'g'). Default is 'Bq'.
- **check** (bool) - Optional - Whether to validate contents and decay data. Default is True.
- **decay_data** (DecayData) - Optional - The decay dataset to use.
```

--------------------------------

### Calculate Isotope Activities After Decay

Source: https://radioactivedecay.github.io/_sources/tutorial.rst.txt

Demonstrates using the decay() method to calculate activities of isotopes after a specified time period.

```python
>>> inv_t1 = inv_t0.decay(1E9, 'y')
>>> inv_t1.activities('Bq')
{'Ac-227': 5054315.0114205815, 'At-218': 50337.39144073731,
 'At-219': 4.184972829456502, 'Bi-210': 251686958.45501313,
 'Bi-211': 5054319.0714315465, 'Bi-214': 251686906.8663001,
 'Bi-215': 4.059423644572891, 'Fr-223': 69749.54715760818,
 'Hg-206': 4.782052210630576, 'Pa-231': 5054314.855110146,
 'Pa-234': 402670.06690959306, 'Pa-234m': 251668791.81845263,
 'Pb-206': 0.0, 'Pb-207': 0.0,
 'Pb-210': 251686958.45423996, 'Pb-211': 5054319.071431517,
 'Pb-214': 251636619.8122487, 'Po-210': 251686958.47635475,
 'Po-211': 13949.920637151068, 'Po-214': 251634102.95324954,
 'Po-215': 5054319.071431024, 'Po-218': 251686957.20368654,
 'Ra-223': 5054315.01200738, 'Ra-226': 251686957.20309648,
 'Rn-218': 50.33739144073732, 'Rn-219': 5054315.01200738,
 'Rn-222': 251686957.20368624, 'Th-227': 4984565.464625097,
 'Th-230': 251686867.07347885, 'Th-231': 5054079.657163195,
 'Th-234': 251668791.81845245, 'Tl-206': 337.00883737124855,
 'Tl-207': 5040369.15079446, 'Tl-210': 52854.250441923046,
 'U-234': 251682620.8433893, 'U-235': 5054079.657142295,
 'U-238': 251668791.8147358}
```

--------------------------------

### Plotting inventory decay graphs

Source: https://radioactivedecay.github.io/_sources/plotting.rst.txt

Creates graphs showing the decay of nuclides in an inventory over time, with options for scaling and filtering.

```python3
>>> inv = rd.Inventory({'Rn-222': 10.0})
>>> fig, ax = inv.plot(5, 'h')
```

```python3
>>> fig, ax = inv.plot(1000, 'd', xscale='log', yscale='log', xmin=1, ymin=1E-17, yunits='mg')
```

```python3
>>> fig, ax = inv.plot(1000, 'd', display=['Rn-222', 'Pb-210', 'Po-210'], xscale='log', yscale='log', xmin=1, ymin=1E-8)
```

```python3
>>> fig, ax = inv.plot(5, 'h', order='alphabetical')
```

--------------------------------

### Initialize and Analyze Radioactive Decay Inventory

Source: https://radioactivedecay.github.io/_sources/tutorial.rst.txt

Initializes an inventory with specific isotope quantities and generates a decay time series dataframe. The resulting dataframe can be filtered to isolate isotopes exceeding a specific quantity threshold.

```python
>>> inv = rd.Inventory({'U-238': 2000.0, 'U-235': 3000.0, 'U-234': 1500.0}, 'num')
>>> df = inv.decay_time_series_pandas(time_period=1E9, time_units='y', decay_units='num', npoints=10)
>>> df
                Ac-227        At-218        At-219        Bi-210        Bi-211        Bi-214        Bi-215        Fr-223        Hg-206  ...    Th-230        Th-231        Th-234        Tl-206        Tl-207        Tl-210        U-234        U-235        U-238
Time (y)                                                                                                                                ...                                                                                                                       
0.000000e+00  0.000000  0.000000e+00  0.000000e+00  0.000000e+00  0.000000e+00  0.000000e+00  0.000000e+00  0.000000e+00  0.000000e+00  ...  0.000000  0.000000e+00  0.000000e+00  0.000000e+00  0.000000e+00  0.000000e+00  1500.000000  3000.000000  2000.000000
1.111111e+08  0.000083  4.183008e-18  5.612824e-18  6.039192e-09  1.554277e-11  1.664837e-11  4.433329e-17  2.205038e-12  1.295477e-19  ...  0.033168  1.112054e-08  2.903132e-08  4.704880e-18  3.454878e-11  2.283922e-16     0.108020  2689.120153  1965.820782
2.222222e+08  0.000075  4.111522e-18  5.031186e-18  5.935985e-09  1.393213e-11  1.636385e-11  3.973918e-17  1.976537e-12  1.273338e-19  ...  0.032601  9.968160e-09  2.853519e-08  4.624475e-18  3.096861e-11  2.244890e-16     0.106174  2410.455732  1932.225673
3.333333e+08  0.000067  4.041257e-18  4.509821e-18  5.834541e-09  1.248839e-11  1.608420e-11  3.562115e-17  1.771716e-12  1.251577e-19  ...  0.032044  8.935193e-09  2.804754e-08  4.545445e-18  2.775944e-11  2.206526e-16     0.104360  2160.668362  1899.204692
4.444444e+08  0.000060  3.972194e-18  4.042484e-18  5.734831e-09  1.119426e-11  1.580933e-11  3.192985e-17  1.588119e-12  1.230188e-19  ...  0.031496  8.009269e-09  2.756821e-08  4.467765e-18  2.488282e-11  2.168817e-16     0.102577  1936.765612  1866.748026
5.555556e+08  0.000054  3.904311e-18  3.623575e-18  5.636825e-09  1.003423e-11  1.553915e-11  2.862107e-17  1.423547e-12  1.209165e-19  ...  0.030958  7.179296e-09  2.709708e-08  4.391413e-18  2.230430e-11  2.131753e-16     0.100824  1736.065147  1834.846033
6.666667e+08  0.000048  3.837588e-18  3.248076e-18  5.540494e-09  8.994421e-12  1.527360e-11  2.565516e-17  1.276030e-12  1.188501e-19  ...  0.030429  6.435330e-09  2.663401e-08  4.316365e-18  1.999298e-11  2.095322e-16     0.099100  1556.162591  1803.489231
7.777778e+08  0.000043  3.772005e-18  2.911489e-18  5.445809e-09  8.062360e-12  1.501258e-11  2.299660e-17  1.143799e-12  1.168190e-19  ...  0.029909  5.768458e-09  2.617884e-08  4.242600e-18  1.792117e-11  2.059514e-16     0.097407  1394.902728  1772.668305
8.888889e+08  0.000039  3.707543e-18  2.609781e-18  5.352742e-09  7.226885e-12  1.475602e-11  2.061354e-17  1.025271e-12  1.148226e-19  ...  0.029398  5.170692e-09  2.573145e-08  4.170096e-18  1.606406e-11  2.024318e-16     0.095742  1250.353679  1742.374097
1.000000e+09  0.000035  3.644182e-18  2.339338e-18  5.261266e-09  6.477987e-12  1.450384e-11  1.847743e-17  9.190258e-13  1.128603e-19  ...  0.028895  4.634871e-09  2.529171e-08  4.098830e-18  1.439940e-11  1.989723e-16     0.094106  1120.783759  1712.597605

[10 rows x 37 columns]
>>> df.loc[:, df.max() > 100]
                  Pb-206       Pb-207        U-234        U-235        U-238
Time (y)                                                                     
0.000000e+00     0.000000     0.000000  1500.000000  3000.000000  2000.000000
1.111111e+08  1534.039370   310.754872     0.108020  2689.120153  1965.820782
2.222222e+08  1567.636948   589.432493     0.106174  2410.455732  1932.225673
3.333333e+08  1600.660357   839.231695     0.104360  2160.668362  1899.204692
4.444444e+08  1633.119409  1063.145051     0.102577  1936.765612  1866.748026
5.555556e+08  1665.023749  1263.855025     0.100824  1736.065147  1834.846033
6.666667e+08  1696.382856  1443.766102     0.099100  1556.162591  1803.489231
7.777778e+08  1727.206048  1605.033604     0.097407  1394.902728  1772.668305
8.888889e+08  1757.502483  1749.589500     0.095742  1250.353679  1742.374097
1.000000e+09  1787.281165  1879.165558     0.094106  1120.783759  1712.597605
```

--------------------------------

### Standard Inventory Decay Calculation

Source: https://radioactivedecay.github.io/_sources/theory.rst.txt

Demonstrates a standard decay calculation for Es-254, which may result in small numerical artifacts for progeny activities.

```python
>>> inv = rd.Inventory({'Es-254': 1.0})
>>> inv.decay(0.0).activities()
{'At-218': -8.24439035981494e-30, 'Bi-210': 2.5308844932098316e-26,
 'Bi-214': -4.256549745172888e-26, 'Bk-250': 0.0,
 'Cf-250': 0.0, 'Cm-246': 8.802967479989175e-21,
 'Es-254': 1.0, 'Fm-254': 0.0,
 'Hg-206': -3.4696439711117526e-34, 'Pa-234': 2.330729590281097e-29,
 'Pa-234m': -1.5696690930108473e-26, 'Pb-206': 0.0,
 'Pb-210': 2.673060958594837e-26, 'Pb-214': -7.310828272597407e-27,
 'Po-210': -1.048466176320909e-27, 'Po-214': 2.3260114484256133e-26,
 'Po-218': -1.1433437709020225e-26, 'Pu-242': 1.3827905917787723e-22,
 'Ra-226': -1.0811575068833228e-26, 'Rn-218': -1.618765025703667e-33,
 'Rn-222': -1.581593359682259e-26, 'Th-230': -1.2628442466252288e-26,
 'Th-234': -2.6140879622245746e-27, 'Tl-206': -4.332210492987691e-34,
 'Tl-210': 2.2028710112960294e-31, 'U-234': -1.0389580591195201e-26,
 'U-238': -8.466705440297454e-27}
```

--------------------------------

### Manage Inventory with Nuclide Objects

Source: https://radioactivedecay.github.io/_sources/tutorial.rst.txt

Use Nuclide objects instead of strings when initializing or modifying an Inventory. Note that the Inventory's decay dataset takes precedence if it differs from the Nuclide's.

```python3
>>> H3 = rd.Nuclide('H-3')
>>> inv = rd.Inventory({H3: 1.0})
>>> inv.activities()
{'H-3': 1.0}
>>> Be10 = rd.Nuclide('Be-10')
>>> inv.add({Be10: 2.0})
>>> inv.activities()
{'Be-10': 2.0, 'H-3': 1.0}
>>> inv.remove(H3)
>>> inv.activities()
{'Be-10': 2.0}
```

--------------------------------

### load_dataset(dataset_name, dir_path=None, load_sympy=False)

Source: https://radioactivedecay.github.io/decaydata.html

Loads a radioactive decay dataset from either the bundled sub-packages or a specified local directory.

```APIDOC
## load_dataset(dataset_name, dir_path=None, load_sympy=False)

### Description
Loads a decay dataset, either from a set of data files packaged within radioactivedecay, or by specifying a local directory containing the data files.

### Parameters
- **dataset_name** (str) - Required - Name of the decay dataset (or sub-package directory name).
- **dir_path** (None or str) - Optional - Path to the directory containing the decay dataset files. Default is None.
- **load_sympy** (bool) - Optional - Load SymPy version of the decay data for arbitrary-precision decay calculations. Default is False.

### Returns
- **DecayData** - A decay dataset object used by radioactivedecay.
```

--------------------------------

### Calculating Activity Fractions

Source: https://radioactivedecay.github.io/inventory.html

Determine the proportion of total activity contributed by each nuclide in the inventory.

```python
>>> rd.Inventory({'Tc-99m': 2.3, 'I-123': 5.8}, 'Bq').activity_fractions()
{'I-123': 0.7160493827160493, 'Tc-99m': 0.2839506172839506}
```

--------------------------------

### Calculate Mole Fractions

Source: https://radioactivedecay.github.io/inventory.html

Returns a dictionary containing the mole fraction of each nuclide in the inventory.

```python
>>> rd.Inventory({'Tc-99m': 2.3, 'I-123': 5.8}, 'Bq').mole_fractions()
{'I-123': 0.8476385041932588, 'Tc-99m': 0.15236149580674116}
```

--------------------------------

### Build nuclide string

Source: https://radioactivedecay.github.io/utils.html

Constructs a nuclide string in symbol-mass format from atomic number and mass.

```python
>>> rd.utils.build_nuclide_string(26, 56)
'Fe-56'
>>> rd.utils.build_nuclide_string(28, 56, 'm')
'Fe-56m'
```

--------------------------------

### Retrieving Inventory Activities

Source: https://radioactivedecay.github.io/inventory.html

Calculate and return the activity of each nuclide in the inventory in specified units.

```python
>>> rd.Inventory({'Tc-99m': 2300, 'I-123': 5800}, 'Bq').activities('kBq')
{'I-123': 5.8, 'Tc-99m': 2.3}
```

--------------------------------

### Scale Inventory by Constants

Source: https://radioactivedecay.github.io/_sources/tutorial.rst.txt

Multiply or divide all nuclide amounts in an inventory by a constant value.

```python3
>>> inv = rd.Inventory({'Sr-90': 1.0, 'Cs-137': 1.0}, 'num')
>>> inv = 2*inv
>>> inv.numbers()
{'Sr-90': 2.0, 'Cs-137': 2.0}
>>> inv = inv / 2
>>> inv.numbers()
{'Sr-90': 1.0, 'Cs-137': 1.0}
```

--------------------------------

### Accessing atomic mass

Source: https://radioactivedecay.github.io/nuclide.html

Retrieving the atomic mass in g/mol.

```python
>>> H3 = rd.Nuclide('H-3')
>>> H3.atomic_mass
3.01604928132
>>> Ba137m = rd.Nuclide('Ba-137m')
>>> Ba137m.atomic_mass
136.9065375271172
```

--------------------------------

### plot()

Source: https://radioactivedecay.github.io/inventory.html

Plots a decay graph using high precision decay calculations.

```APIDOC
## plot(xmax, xunits='s', xmin=0.0, xscale='linear', yscale='linear', ymin=0.0, ymax=None, yunits='Bq', display='all', order='dataset', npoints=51, fig=None, axes=None, **kwargs)

### Description
Plots a decay graph using high precision decay calculations.

### Parameters
- **xmax** (float) - Required - Maximum decay time on x-axis.
- **xunits** (str) - Optional - Units for decay times. Default is 's'.
- **xmin** (float) - Optional - Minimum decay time on x-axis.
- **xscale** (str) - Optional - Time axis scale type ('linear' or 'log'). Default is 'linear'.
- **yscale** (str) - Optional - Y-axis scale type ('linear' or 'log'). Default is 'linear'.
- **ymin** (float) - Optional - Minimum value for the y-axis.
- **ymax** (float) - Optional - Maximum value for the y-axis.
- **yunits** (str) - Optional - Units to display on the y-axis. Default is 'Bq'.
- **display** (str/list) - Optional - Nuclides to display. Default is 'all'.
- **order** (str) - Optional - Order to display decay curves ('dataset' or 'alphabetical'). Default is 'dataset'.
- **npoints** (int) - Optional - Number of time points. Default is 51.

### Returns
- **tuple[Figure, Axes]** - A tuple containing the matplotlib figure and axes objects.
```

--------------------------------

### Calculate Mass Fractions

Source: https://radioactivedecay.github.io/inventory.html

Returns a dictionary containing the mass fraction of each nuclide in the inventory.

```python
>>> rd.Inventory({'Tc-99m': 2.3, 'I-123': 5.8}, 'Bq').mass_fractions()
{'I-123': 0.8736297770616593, 'Tc-99m': 0.12637022293834066}
```

--------------------------------

### Nuclide Class Constructor

Source: https://radioactivedecay.github.io/nuclide.html

Initializes a new Nuclide instance from a name string or canonical ID.

```APIDOC
## Class: Nuclide

### Description
Represents a single nuclide. Can be constructed from a string (e.g., 'H-3') or a canonical ID (zzzaaassss).

### Constructor
`Nuclide(nuclide: str | int, decay_data: DecayData = None)`

### Parameters
- **nuclide** (str | int) - Required - The nuclide name or canonical ID.
- **decay_data** (DecayData) - Optional - The decay dataset to use (defaults to ICRP-107).
```

--------------------------------

### activities

Source: https://radioactivedecay.github.io/inventory.html

Returns the activity of each nuclide in the inventory.

```APIDOC
## activities(units='Bq')

### Description
Calculates and returns the activity of each nuclide in the inventory as a dictionary.

### Parameters
- **units** (str) - Optional - The units for the returned activity values. Default is 'Bq'.
```

--------------------------------

### Export Inventory to CSV

Source: https://radioactivedecay.github.io/_sources/tutorial.rst.txt

Write inventory contents to a file using the to_csv method with custom delimiters and unit formatting.

```python3
>>> inv = rd.Inventory({'Cs-137': 1.02, 'Sr-90': 3.05}, 'Bq')
>>> inv.to_csv('test_output.csv', units='mBq', delimiter='|', write_units=True, header=["nuclide", "quantity", "units"])
```

```text
nuclide|amount|units
Cs-137|1020.0|mBq
Sr-90|3050.0|mBq
```

--------------------------------

### to_csv

Source: https://radioactivedecay.github.io/inventory.html

Writes the inventory contents to a CSV file.

```APIDOC
## to_csv(filename, units='Bq', delimiter=',', write_units=False, header=None, encoding='utf-8')

### Description
Exports the current inventory data to a CSV file format.

### Parameters
- **filename** (str|Path) - Required - Path to the output file.
- **units** (str) - Optional - Output units for quantities. Default is 'Bq'.
- **delimiter** (str) - Optional - Delimiter character. Default is ','.
- **write_units** (bool) - Optional - Whether to include a units column. Default is False.
- **header** (list[str]|None) - Optional - List of column names for the header row.
- **encoding** (str) - Optional - File encoding. Default is 'utf-8'.
```

--------------------------------

### decay_time_series_pandas(time_period, time_units='s', time_scale='linear', decay_units='Bq', npoints=501)

Source: https://radioactivedecay.github.io/inventory.html

Returns a pandas DataFrame with the initial isotope and all decay progeny decayed for the amount of time specified.

```APIDOC
## decay_time_series_pandas(time_period, time_units='s', time_scale='linear', decay_units='Bq', npoints=501)

### Description
Returns a pandas DataFrame containing the decay data for the initial isotope and all progeny over the specified time period.

### Parameters
- **time_period** (float | ndarray) - Required - Time to decay the chain.
- **time_units** (str) - Optional - Units for time series.
- **time_scale** (str) - Optional - 'linear' or 'log'.
- **decay_units** (str) - Optional - Units for decayed values.
- **npoints** (int) - Optional - Number of time points.

### Response
- **DataFrame** - A pandas DataFrame containing the decay time series data.
```

--------------------------------

### Calculate Branching Fractions

Source: https://radioactivedecay.github.io/inventory.html

Retrieves the branching fractions for nuclides in the inventory.

```python
>>> inv = rd.Inventory({'C-14': 1.0, 'K-40': 2.0}, 'Bq')
>>> inv.branching_fractions()
{'C-14': [1.0], 'K-40': [0.8914, 0.1086])
```

--------------------------------

### radioactivedecay.fileio.read_csv

Source: https://radioactivedecay.github.io/fileio.html

Creates an Inventory or InventoryHP instance by reading nuclide quantities from a CSV or TSV file.

```APIDOC
## radioactivedecay.fileio.read_csv(filepath, inventory_type='Inventory', units=None, decay_data=None, delimiter=',', skip_rows=0, encoding='utf-8')

### Description
Create an inventory by reading from a CSV file. The file must contain at least two columns: nuclide strings/canonical ids and quantities. An optional third column can specify units.

### Parameters
- **filepath** (str or pathlib.Path) - Required - Name or path of the file to read in.
- **inventory_type** (str) - Optional - The type of inventory to create: 'Inventory' (default) or 'InventoryHP'.
- **units** (str or None) - Optional - The units of the nuclide quantities. Overridden by units specified in the file.
- **decay_data** (DecayData or None) - Optional - The decay dataset to use. Defaults to ICRP-107.
- **delimiter** (str) - Optional - The delimiter used to separate items. Default is ','.
- **skip_rows** (int) - Optional - Number of rows to ignore at the start of the file. Default is 0.
- **encoding** (str) - Optional - Encoding of the file. Default is 'utf-8'.

### Returns
- **Inventory | InventoryHP** - An inventory instance populated with the data from the file.

### Raises
- **ValueError** - If the file or function parameters are invalid.
```

--------------------------------

### build_id(Z, A, state='')

Source: https://radioactivedecay.github.io/utils.html

Builds a canonical nuclide id from atomic number, atomic mass, and energy state.

```APIDOC
## build_id(Z, A, state='')

### Description
Builds a canonical nuclide id from atomic number, atomic mass, and energy state.

### Parameters
- **Z** (int) - Required - Atomic number.
- **A** (int) - Required - Atomic mass.
- **state** (str) - Optional - Energy state.

### Returns
- (int) - Canonical nuclide id.
```

--------------------------------

### decay_time_series(time_period, time_units='s', time_scale='linear', decay_units='Bq', npoints=501)

Source: https://radioactivedecay.github.io/inventory.html

Returns a tuple containing time points and decay data for the initial isotope and all progeny over a specified time period.

```APIDOC
## decay_time_series(time_period, time_units='s', time_scale='linear', decay_units='Bq', npoints=501)

### Description
Returns a tuple with time data and decay data for the initial isotope and all progeny decayed for the specified time_period.

### Parameters
- **time_period** (float | ndarray) - Required - Time to decay the chain.
- **time_units** (str) - Optional - Units for time series (default 's').
- **time_scale** (str) - Optional - 'linear' or 'log' (default 'linear').
- **decay_units** (str) - Optional - Units for decayed values (default 'Bq').
- **npoints** (int) - Optional - Number of time points (default 501).

### Response
- **tuple[list[float], dict[str, list[float]]]** - A tuple containing the time points list and a dictionary of isotopes with their decay data lists.
```

--------------------------------

### Retrieve Progeny and Decay Modes

Source: https://radioactivedecay.github.io/_sources/tutorial.rst.txt

Obtain direct progeny, branching fractions, and decay modes for a radionuclide.

```python3
>>> nuc.progeny()
['Te-123', 'Te-123m']
>>> nuc.branching_fractions()
[0.99996, 4.442e-05]
>>> nuc.decay_modes()
['EC', 'EC']
```

--------------------------------

### Retrieve Inventory Progeny

Source: https://radioactivedecay.github.io/inventory.html

Returns a dictionary mapping nuclides to their direct progeny, ordered by branching fraction.

```python
>>> inv = rd.Inventory({'C-14': 1.0, 'K-40': 2.0}, 'Bq')
>>> inv.progeny()
{'C-14': ['N-14'], 'K-40': ['Ca-40', 'Ar-40'])
```

--------------------------------

### Perform Inventory Addition

Source: https://radioactivedecay.github.io/_sources/tutorial.rst.txt

Combine the contents of two inventories using the addition operator.

```python3
>>> inv1 = rd.Inventory({'H-3': 1.0}, 'g')
>>> inv2 = rd.Inventory({'C-14': 1.0}, 'g')
>>> inv = inv1 + inv2
>>> inv.masses()
{'C-14': 1.0, 'H-3': 1.0}
```

--------------------------------

### Inventory Operations with Units

Source: https://radioactivedecay.github.io/_sources/tutorial.rst.txt

Perform inventory modifications using different input units such as number of atoms or mass.

```python3
>>> inv.add({'H-3': 1.3E9}, 'num')
>>> inv.activities()
{'C-14': 3.0, 'H-3': 2.3177330463306007}
>>> inv.subtract({'C-14': 7.1E-12}, 'g')
>>> inv.activities()
{'C-14': 1.8233790683016682, 'H-3': 2.3177330463306007}
```

--------------------------------

### branching_fraction(parent, progeny)

Source: https://radioactivedecay.github.io/decaydata.html

Returns the branching fraction for a specified parent to progeny transition.

```APIDOC
## branching_fraction(parent: str, progeny: str) -> float

### Description
Returns the branching fraction for parent to progeny (if it exists).

### Parameters
- **parent** (str) - Required - Nuclide string of the parent.
- **progeny** (str) - Required - Nuclide string of the progeny (can be stable or radioactive nuclide).

### Returns
- **float** - Branching fraction (or zero if progeny is not actually a direct progeny of parent).
```

--------------------------------

### Plot inventory decay

Source: https://radioactivedecay.github.io/_sources/overview.rst.txt

Visualize the decay of an inventory over a specified time period.

```python3
>>> inv_t0.plot(100, 'y')
```

--------------------------------

### Retrieve Nuclides List

Source: https://radioactivedecay.github.io/inventory.html

Returns a list of all nuclides present in the inventory.

```python
>>> rd.Inventory({'Tc-99m': 2.3, 'I-123': 5.8}, 'Bq').nuclides
['I-123', 'Tc-99m']
```