Model 23-1 Electronic Personal Dosimeter


Model 23-1 Electronic Personal Dosimeter


The Ludlum Model 23-1 mSv Electronic Personal Dosimeter is a compact and lightweight (55.9 g / 2.1 oz) pen-type personal dosimeter. It is ideal for the measurement and general monitoring of gamma and X-ray radiation in medical and laboratory environments, as well as any controlled or restricted area where personal radiation monitoring is required or desired. The unit is sensitive to a wide range of energies from 35 keV to 3 MeV. Dose, Dose Equivalent Rate, and alarm values are easily seen on the four-digit LCD screen. An audible alarm is activated if the dose or dose rate exceeds the preset value of the dosimeter. The alarm set points are adjustable from the face of the unit.

For users with multiple EPD units the optional Model 23 mSv Electronic Personal Dosimeter Reader/Software Kit can be used to quickly take data directly from the mSv Electronic Personal Dosimeter via infrared communication to the user’s PC. The software also allows the user to set or change alarm set points quickly.

  • Low Weight and Slim Design
  • X-ray and Gamma Radiation Monitoring
  • Audible Alarm
  • 600 Record Data Logging Option Available
  • INDICATED USE: dosimetry monitoring of personnel
    0.001 mSv to 999.9 mSv (0.1 mrem to 99.99 rem)
    0.001 mSv/h to 999.9 mSv/h (0.1 mrem/hr to 99.99 rem/hr)
    Accumulated dose data is automatically deleted when Model 23 EPD is switched ‘On’.
  • DETECTOR: silicon semiconductor
  • RADIATION DETECTED: gamma and X-ray (35 keV to 3 MeV)
  • DISPLAY: 4-digit liquid crystal display, with dose rate, low battery, overflow
  • ACCURACY/LINEARITY: +/- 10% from 0.01 to 999.9 mSv; 1.0 mrem to 99.99 rem (137Cs)
  • ALARM OUTPUT: low, medium, high user-settable volume, and OFF
  • ALARM VOLUME: approximately 60 dB
  • SENSITIVITY: approximately 2 cpm/μSv/h (20 cpm/mR/hr) (137Cs gamma)
  • DATA LOGGING: 600 records (optional IR reader required for data transmission to PC)
  • ENVIRONMENT: -10 to 40 °C (14 to 104 °F); ≤ 90% relative humidity (non-condensing)
  • POWER: one each coin-type lithium battery (CR2450) Part Number 21-8639
  • BATTERY LIFE: typically one month at eight hours per day in non-alarm status
  • SIZE: 110 x 30 x 12 mm (4.3 x 1.8 x 0.5 in.) (H x W x D) without clip
  • WEIGHT: 55.9 g (2 oz.)
Code Description
51-2961 Model 23-1, Electronic Personal Dosimeter
51-2959 Infrared reader that connects to Model 23-Series dosimeters.

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