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External Radiation Dose Calculator
(Virtual Geiger Counter)

(last updated 13 Feb 2024)
Requires Firefox 3.5, Internet Explorer 9, or higher. JavaScript must be enabled.
For optional graphical output, the browser must be HTML 5-capable.
For educational purposes only. No warranty. ORNL is the source of the decay data used in this calculator.

Calculate radiation dose from shielded gamma source.

Enter parameters and click the "Calculate" button below. HELP
Numbers can be entered in exponential notation: 5 · 10-6 = 5e-6

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Mode     HELP
Select here before any other entry!
(Selection resets all other parameters)
Example data sets
Number of
Shield layers:

Point Source Shielding in free air
48Y Cylinder with Heels from UF6_nat
30B Cylinder with Heels from UF6_enr
DU bullet buried in soil
Volume Source Soil cover 40 CFR 192
Soil cover for uranium mill tailings
48Y Cylinder with UF6_nat
30B Cylinder with UF6_enr
Reprocessed uranium storage
Depleted uranium storage


              Cosmic Radiation Parameters             HELP
Altitude [m above sea level]
Latitude []
Indoor: Shielding factor

  Geometry Parameters       HELP
y - Distance of receptor from x-axis [cm]
- or - b - Distance of receptor from shield rear surface [cm]

        Output Parameters             HELP
Dose OptionsGraph DetailResult Detail
Terrestrial gamma dose coeff. in air [Sv/Gy]

Use buildup factors for:
Show total situation

Show integration grid

Show dose color map:
      x Raster width [pixel]
      y Raster width [pixel]
      Logarithmic color scale:
Dose from each layer:

Sorry: HTML 5-capable browser required for graphical output.

Select other receptor locations with mouse click!


(... copy and paste ...)


> See also:


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