get_half_life_from_radionuclide
=====================================================

.. py:function:: petpal.utils.image_io.get_half_life_from_radionuclide(meta_data_file_path: str) -> float

   Extracts the radionuclide half-life in seconds from a nifti metadata file. This function
   grabs the tracer radionuclide from the metadata and assumes a fixed half-life based on this.
   Code borrowed from:
   https://github.com/bilgelm/dynamicpet/blob/main/src/dynamicpet/petbids/petbidsjson.py.

   :param meta_data_file_path: Path to the nifti metadata file.
   :type meta_data_file_path: str

   :returns: *float* -- The radionuclide half-life extracted from the tracer radionuclide.

   :raises FileNotFoundError: If the metadata file does not exist at the provided path.
   :raises KeyError: If the 'TracerRadionuclide' key is not found in the metadata file.