Radiation Dose Calculator

Calculate occupational radiation dose from external gamma sources using inverse square law, shielding HVLs, and compare against OSHA/NRC annual dose limits.

Inputs

Source activity (GBq)

Gamma constant (µSv·m²/(GBq·hr))

Distance from source (m)

Shielding (# of HVLs)

Exposure hours/day

Workdays per year

Tab to move between fields

Results

Dose rate (µSv/hr)

16.25

Daily dose (µSv)97.5

Annual dose (mSv)24.38

% of OSHA limit (50 mSv/yr)48.8%

2 µSv/hr boundary (m)5.7

0.25 µSv/hr boundary (m)16.12

(%) Icrp Limit121.88%

How to Use This Calculator

Enter Source activity (GBq), Gamma constant (µSv·m²/(GBq·hr)), and Distance from source (m).
Set Shielding (# of HVLs), Exposure hours/day, and Workdays per year.
Review the Dose rate (µSv/hr) result.
Use Daily dose (µSv) and Annual dose (mSv) to inform your decision.

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