Page 207 - Radiation Safety

Chemical

Natural K 40 symbol & mass
number
abundance

(atom %) 0.0117
1.28E9 a Half life, annum

-
Decay mode and Β 1.33, ε
energies γ 1460.8
+
β vw
σ 30 σ 4.4 σ .42
α
γ
p
Beta decay
energy (MeV)
E- 1.3111 E+ 1.5049

Naturally Occurring Radionuclide

43