Download PDF Manual Here: manual_type4_lite

On line Manual for iPhone/iPad/iPod

















Manual for Pro-version APP

Pro-version supports GPS-based dose rate mapping, logging and some special graphs.  On your iOS device, select Settings, Privacy and Location services “on” for ‘Pocket Geiger’ before using Pro-version. Open Pro version App,


select Type1, 2, 3 or 4 on setting menu according to the type of your Pocket Geiger.

  1. Application Usage
    Main Screen
  • Status shown at the top of the screen: Software Version, Detector Type, RMS (Root Mean Square) for microphone input voltage and the Type of iOS device.
  • Use On (Start) and Off (stop) switch to take measurement. It takes at least 15 minutes if you live in low dose-rate area <0.1uSv/h.
  • Outdoor and Indoor: the information will be logged with readings.
  • Send Graph: Send each graph (Input, MCA, Count, uSv/h and Dose) via email. You need to set up email settings on your iOS device
  • Clear to delete all measurement data.
  • Readings: [cpm] shows counts per minutes for gamma particle by calculating moving average, and [uSv/h] shows a dose rate. Statistical error range (one sigma) is displayed after +- sign.


[Main] -> [Input]
Red line on the graph shows Input voltage from Pocket Geiger. You can see the background noise when Type1 or 2 are working. Type 3 and 4 has digital output so you cannot see such noise when you use them. Green line on the graph shows RMS (Root Mean Square) of the input signal. Blue line on the graph shows threshold for radiation detection. You can change the value in Settings menu.


[Main] -> [MCA]

This function provides histogram of peak energy of radiation pulse, which is like Multi-Channel-Analyzer. Y-axis is a number of counts and it will be re-scaled automatically. X-axis is peak energy and you can change the scale on setting menu. Notice that this function is for future R&D use. Generally, nuclide identification is not possible by using Si-based detector because of Compton Effect. You can check absorption cross section for Si at  NIST XCOM . You cannot see Compton tale when you use Type3 or Type4 because they have digital output.


[Main] -> [Count]

Y-axis [count]:  Number of count per a unit time (about 200msec), in chronological order. The scale will be adjusted automatically.

X-axis [min]: X-axis is an elapsed time. You can set the scale (time range) in setting menu. It will be used as a time constant to calculate [cpm] and [uSv/h] by moving average.

 [Main] -> [uSv/h]

Y-axis [uSv/h]: [uSv/h] readings  in chronological order; The red line is moving average and the blue band indicates counting error (1 sigma). The scale for Y-axis will be automatically adjusted.

X-axis [min]: X-axis is an elapsed time. You can set the scale (time range) in setting menu. It will be used as a time constant to calculate [cpm] and [uSv/h] by moving average.

 [Main] -> [Dose]

Y-axis [uSv]: Total dose. The scale will be adjusted automatically.

X-axis [hour]: Elapsed time. You can change the scale in Setting menu.


  • List view: You can see measured data and geographical information by touching each cell.
  • Send Log: Send the log via email. You should set up email settings on your iOS device.
  • Clear Log: Delete all logs.
  • Share button: Upload the log to the server of Radiation-watch project for sharing with Pocket Geiger users. You can see shared data in Map menu.


  • My Log: Plot your measurement data on the map. You can see the details by touching each pin.
  • Shared Data: Plot shared measurement data by Pocket Geiger users.
  • User Location: Move to your geographical position.

Notice that Log and Map functions are available only if your iOS device has GPS or WiFi connection and only when you have permitted providing measurement data in Setting menu.

 [Circuit] You can see the circuit diagram for Pocket Geiger Type1. The diagram is protected by copyright.


  • Default: Reset all settings to default value.
  • Measurement:  Set your original values of threshold to distinguish background noise and radiation pulse on audio input, and the conversion factor to calculate [uSv/h] from [cpm]. You can re-calibrate Pocket Geiger when you go to some official monitoring post and check the radiation level there.  i.e. when the reading of the monitoring post is 0.05[usv/h] and Pocket Geiger shows 1[cpm], the conversion factor should be [cpm] / [uSv/h] = 20.
  • Time Range:  Set scales (Time Range) for graphs on Count, uSv/h and Dose menu. Note that the Time Range for Count mode will be used as a time constant to calculate [cpm] and [uSv/h] by moving average. It should be over 20[min] when you use it in low dose-rate area <0.1uSv/h.
  • MCA:  Set number of channels (partitions of histogram). The MCA graph will be re-plotted when you change the value.
    • Optional
      • No Sleep: You can cancel screen saver of your iOS device.
      • Excluding the NOISE: The function enables NOISE canceling. It works only for big and sharp noise.
      • One time measurement: Measure at one time for the Time Range of Count setting.
      • Test Mode: You can temporally cancel sending measurement data to the server. Please turn off the function to use Log and Map menu.
      • Providing measurement data: You can allow providing measurement data to the server. Note that the data will be never shared unless you touch Share button. Please turn on the function to use Log and Map menu.
      • Type of Pocket Geiger: Switch Pocket Geiger Type2, Type3,Type4 or Type 6.




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