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The advanced PENs are direct reading radiation dosimeters

They are rugged, precision instruments with a higher quality and reliability than other dosimeters of its type. They measure and directly read accumulated dose of gamma and x-ray exposure. A sturdy metal clip attaches the dosimeter to a pocket or any object to monitor total radiation exposure. They are hermetically sealed and immersion proof. PEN dosimeters are designed to satisfy military specifications for the RADIAC METER IM-264/PD and ANSI N 13.5 and N322 requirements.

Exposure Range (gamma and x-rays)

  • PEN200mR Scale increments of 10mR
  • PEN500mR Scale increments of 20mR
  • PEN2R increments of 100 mR
  • PEN5R increments of 200mR
  • PEN20R increments of 1R
  • PEN2mSv increments of .1mSv
  • PEN5mSv increments of .2mSv
  • National Stock Numbers Available

Energy Dependence

±10% maximum change in sensitivity for x and gamma ray energies from 16 keV to 6 MeV.

Electrical Leakage

In the absence of radiation, the dosimeters leakage or self discharge is less than 0.5% of full scale in 24 hours at 50° C. At 20° C dosimeters will read background radiation. After gross over exposure totaling up to 2000 R, the leakage is less than 5% of full scale in 48 hours at 20° C. Thereafter, the leakage will decrease to original values.


±10% of true dose for Cs-137 or Co-60 gamma.

Charging Voltage

Dosimeters are capable of being charged to “zero” with 140 to 195 volts.

Operational Characteristics

pen dosimeters meter view from insideA maximum change in sensitivity of ±10% may occur under any probable combination of the following:

A) Temperature range below -20°C (-4°F) or above +50°C (122°F)

B) Greater than 50,000 foot altitude for one month

C) Relative humidity greater than 95% Highly resistant to shock and vibration.

Rate Response

Dosimeters are dose rate independent.

Enclosure Material

Barrel – carbon fiber-filled, high-strength, electrically-conducting plastic with metal clip.


Protective sapphire lens, Dosimeter Charger Sold Separately


Approx. 19 grams (0.7 oz.)


PEN- 200, 500 2mSv, 5mSv Length: 11 cm (4.48 inches) Diameter: 1.5 cm (0.6 inches) PEN- 2, 5, 20 Length: 11.5 cm (4.52 inches) Diameter: 1.5 cm (0.6 inches)


2 year limited warranty