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PDM-501 is an electronic pocket dosemeter with high sensitivity for Gamma (X-ray) in a pocketable shape.
The accumulated dose is easy to read with the digital display. This is one of the best suited models for personal exposure measurement.


  • For measurement of personal exposure to Gamma
  • High sensitivity and wide range from 0.01 μSv to 1 Sv
  • Alarms by sound, flashes of light and vibration
  • Easy to read by digital indication of LCD
  • Measurable equivalent dose rate from 0.01 μSv/h to 10 mSv/h
  • Measured value is maintained even when the power is turned off*1


Radiation detected Gamma and X-ray
Energy threshold 60 keV
Detector Silicon semiconductor
Measurement range Dose : 0.01 μSv to 1 Sv
Dose rate : 0.01 μSv/h to 10 mSv/h
Accuracy Within ±10% (0.1 μSv to 1 Sv)
Within ±20% (1 μSv/h to 10 mSv/h)
Alarm Accumulated dose caution and alarm; Dose rate caution and alarm;
Elapsed time caution and alarm
Waterproof and dustproof IP54
Power LR03/AAA alkaline battery
Battery life Approx. 800 hours (at room temperature of 20 degrees C, with measurement
values continuously displayed,
without alarm or backlight, using a AAA alkaline battery manufactured by
Panasonic Corporation)
Environmental requirements in operation Temperature : -10 to +50 degrees C
Humidity : 90% RH or less (Non-condensing or freezing)
Dimensions Approx. 62 (W) x 23 (D) x85 (H) mm (excluding the clip)
Weight Approx. 100 g (including the battery)

*1 To reset the data, hold down the power switch when the power is turned off.

Model selection

  Without alarm With alarm
Gamma Standard PDM-122B PDM-222C
Gamma High Sensitivity   PDM-501
X-ray PDM-127B PDM-227C
Neutron PDM-313 -

This website includes information intended for healthcare professionals.
Please note that all descriptions in this website conform to the Pharmaceutical and Medical Device Act in Japan as well as other laws and regulations in Japan. Model names, specifications and configurations of products in overseas market outside Japan may be different by the countries.