Calculate radiographic exposure time for Ir-192 and Co-60 sources based on source activity, SFD, and material thickness
Input Parameters
Results
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Exposure Time
min
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Exposure (Ci-min)
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Geometric Unsharpness (Ug)
in
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Days to 90% Activity
days
Note: Ir-192 half-life: 73.83 days. Co-60 half-life: 5.27 years. Exposure times are estimates - verify with exposure charts for specific film/screen combinations.
Reference
Exposure: E = Film_Req x 2^(t/HVL) / (gamma x A / SFD_m^2)
HVL: Ir-192 = 0.48" steel, Co-60 = 0.87" steel
Ug = f x OFD / SOD (geometric unsharpness)
Decay: A(t) = A0 x (1/2)^(t/T_half)