Radioactive Material Source Strength:

Becquerels:

Radionuclide Atomic Weight:

Radionuclide Mass:

Disintegration Constant:

where,
Avogadros number = N⁰ = 6.02 x 10²³ atoms/gram-atom,
Q = Becquerels,
W = Radionuclide Atomic Weight,
M = Radionuclide Mass,
K_T = Disintegration Constant.

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