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External Radiation Dose Calculator
(Virtual Geiger Counter)

(last updated 10 Feb 2026)
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.
The decay data is taken from ICRP-07 Data Files © A. Endo and K.F. Eckerman 2008.

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
200L Drum with uranium ore concentrate (UOC)
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 [°] 		Outdoor
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
Decay OptionsDose OptionsResult Detail
Time delay for dose assessment:


Min. branching for progeny:
%

Max. half life for short-lived progeny:
 Terrestrial gamma dose coeff. in air [Sv/Gy]

Use buildup factors for:

 Dose from each layer:


Graph Detail
Show total situation
Show integration grid
Show dose color map:
      Raster width [pixel]
      Logarithmic color scale:
            Decades

 
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Select other receptor locations with mouse click!
 
           HELP  
 

Results

 
(... copy and paste ...)
 


 

> See also:

 

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