Arrow-Tech DRD

The Direct-Reading Dosimeter is a pocket-size, carbon-fiber electroscope with an ion chamber for detecting and indication of integrated exposure to Gamma and X-Ray radiation. It has a thin wall which permits the penetration and detection of radiation.

Dosimeters are extremely sensitive instruments. Although they are constructed for rugged use, they should receive the same care as a wristwatch. Since dosimeters are hermetically sealed at the factory, they cannot be repaired or adjusted in the field. Therefore, if instrument malfunctioning is experienced, the instrument should be returned to the factory or your dealer. Dosimeters may be maintained in operating condition simply by cleaning the eyepiece lens and the charging switch insulator with clean water and a cloth that is free of lint and grit. Make sure the charging switch insulator is absolutely free of lint and moisture at all times.


  • Radiation Detected: Gamma and X-Ray from 16 keV to 6 MeV
  • Range: 0–2 mR to 0–600R (common models are 0-500mR and 0-200mR)
  • Detector: Fiber electrometer mounted in an electrically conductive plastic ion chamber
  • Electrical Leakage: Less than 1% of full scale for 24 hours at 50° C
  • Accuracy: Within +/- 10% of true exposure
  • Operating Conditions: -20°C to +52°C