Direct Reading Pocket Dosimeters

Direct Reading Pocket Dosimeters
Model 138 Shown

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.

Caution: Do not insert any sharp objects into, or tamper with parts in the charging switch recess. Irreparable damage may be done.

We recommend a yearly calibration of the Direct-Reading Dosimeter which is generally consistent with good health physics practices. More frequent calibration may be necessary should the user’s license require a shorter calibration.

Direct Reading Pocket Dosimeters Photon Energy Response
The Direct-Reading Dosimeter is a pocket-sized instrument used to measure x-ray and gamma exposure.

Licensed from the U.S. Government under Patent No. 5,426,305

Dosimeter Models
Models Fluke Reference Range  
138 06-007 0-200mR Low Range
138-S 06-007-2200 0-2mSv Low Range
138-RM   0-200mR/RM Low Range
500   0-500mR Low Range
500-S   0-5mSv Low Range
720   0-2R High Range
725 06-611 0-5R High Range
725-S   0-50mSv High Range
730 06-622 0-20R High Range
740   0-100R High Range
742 60-638 0-200R High Range
746 06-686 0-600R High Range
RM   Rate Meter Rate Meter
A hardened sapphire window can be added to any model, this may be
needed in harsh environments to prevent scratching of the lens.
Our instruments do not contain any radiation sources, they detect radiation only.

Radiation Detected: Gamma and X-Ray from 16 keV to 6 MeV
Ranges: 0-2 mR to 0-600R
Detector: Fiber electrometer mounted in an electrically conductive plastic ion chamber
Detector Housing: Very low permeability plastics-hermetically sealed
Accuracy: Within + or - 10% of true exposure
Rate Response: Dose rate independent for gamma and x-ray
Electrical Leakage: Less than 1.0% of full scale for 24 hours at 50 degrees C
Temperature Range -20 degrees C to + 50 degrees C
Relative Humidity: Up to 90%
Dimensions: Length: 4.5" (12.4 cm) Diameter .6" (1.5 cm)
Weight: 1.0 oz (25 grams)
Finish Barrel and end caps are natural matte black with metal clips
Warranty 2 year limited warranty
ANSI Spec: Manufactured to 13.5 and ANSI N322-1997
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