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Radiation Exclusion Zone Calculator

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GamCPR Calculator Isotope Decay Geometric Unsharpness RT Conversion Tool IQI SmartSelect Film Placement Mobile Rad Exclusion

Radiation Exclusion Zone Calculator

Area Classification ? Dose Rate Limit ? Min. Radius ?
Enter the source activity and select an isotope to calculate radiation boundaries.
How to interpret these results:

The distances shown are the minimum calculated radial distances measured from the centre of the radioactive source in all directions (360°). For example, if the result is 15 m, a boundary with a radius of 15 m should be established around the source position.

Calculations are based on accepted industrial gamma constants and the inverse square law under open air conditions without shielding or collimation. Actual exclusion distances may vary depending on shielding, collimators, scatter radiation, source geometry, local regulations, customer requirements and site specific conditions.

These values are provided as a planning aid only and must always be verified by the responsible Radiation Protection Officer (RPO) or Radiation Safety Officer (RSO).

Errors and omissions excepted.

Visualizing the Zones

The calculations rely on the inverse square law. As distance from the active source (red center) increases, radiation intensity drops rapidly, allowing safe access points.

View GamCPR Close Proximity System