The 40K activity of one gram of potassium.

@article{Samat1997The4A,
  title={The 40K activity of one gram of potassium.},
  author={S B Samat and S. van der Green and Alun H. Beddoe},
  journal={Physics in medicine and biology},
  year={1997},
  volume={42 2},
  pages={
          407-13
        }
}
The activity of 40K in natural potassium as derived from the recent literature varies between 27.33 to 31.31 Bq g-1 of potassium. This paper reports measurements by gamma-ray spectrometry and compares these with independent calculations, yielding values of 30.18 +/- 0.72 Bq g-1 and 31.00 +/- 0.33 Bq g-1 respectively. 
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