Qal-Tek Associates

Model NRF40 - Electronic Personal Dosimeter (EPD)



The Model NRF40 Electronic Personal Dosimeter (EPD) is designed to support official dose of record tracking and is enclosed in a ruggedized enclosure. It employs a silicon diode detector that measures dose rate from 1 to 999.9 mrem/h and tracks dose from 1 to 999.9 rem. Alarms can be set for each as well as stay times so workers are advised of how long they can remain in the present field before exceeding their dose limit. The dosimeter operates for approximately one year with an off-the-shelf battery. Initiating power is performed by removing a pin. Optional storage racks with built-in pins automatically turn these devices on and off whenever users insert or remove the dosimeters. These dosimeters interface to optional readers that can communicate to a central database/RWP system to watch and control dose.

  • Official Dose of Record
  • 1-999.9 mRem/hr Doserate
  • 1-999.9 rem Dose
  • Alarms
  • One Year Battery
  • Ruggedize Enclosure

  • Radiation detected: Gamma(X)-ray
  • Detector: Silicon semiconductor
  • Dose Equivalent range: 0.0 mrem to 999.9 rem, 1.000 rem to 999.9 rem
  • Accuracy: ±10% (0.1 mSv to 9.999 Sv, 137Cs)
  • Energy range: 30 keV to 6 MeV
  • Energy response: ±20% (50 keV to 6 MeV, 137 Cs)
  • Angular response: ±20% (up to ±60 degree, vertical and horizontal, 137Cs), ±50% (up to ±60 degree, vertical and horizontal, 241 Am) ±30% (All around horizontal, 137 Cs, free air)
  • Linearity for wide range of dose rate: 10% (0.1mSv/h to 9.999Sv/h, 137Cs)
  • Display: LCD (with backlight)
  • Alarm volume: 85 dB to 100 dB (at a point 30 cm away from the top of the buzzer)
  • Communication method: Infrared communication
  • Ambient temperature: -20˚C to + 50˚C
  • Ambient humidity: 40% to 95% Non-condensing
  • Power supply: CR123A battery x 1
  • Battery life: 1 year or more (when used for 8 hours a day) 4 months or more (when used for continious monitoring)
  • Size: 2.4″ x 3.2 x 1.1 in (W x H x D, excluding clip)
  • Mass: < 4 oz

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