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Direct-Reading Low-Range Dosimeter Model W138, 0-200 mR â

Direct-Reading Low-Range Dosimeter Model W138, 0-200 mR –

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Direct-Reading Low-Range Dosimeter

Model W138, 0-200 mR –

We ship worldwide and to Japan. We are Japanese owned company. We have operations in Tokyo, Japan. Call us in Tokyo, Japan 080 4444 6571 to buy radiation monitor.

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. This model comes with a hardened sapphire window that won't scratch even in the toughest of conditions.

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.

Recommends 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 interval.

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


Radiation Detected:

Gamma and X-Ray from 16 keV to 6 MeV


Model W138, 0-200 mR –


Fiber electrometer mounted in an electrically conductive plastic ion chamber

Detector Housing:

Very low permeability plastics-hermetically sealed


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 C

Temperature Range:

-20 degrees C to + 50 degrees C

Relative Humidity:

Up to 90%


Length: 4.5” (12.4 cm) Diameter .6 “ (1.5 cm)


1.0 oz (25 grams)


Barrel and End Caps are Natural Matte Black with a metal clip


2 year Limited Warranty

Shelf Life:

Designed for a 20 year shelf life

ANSI Spec:

Manufactured to ANSI N13.5 and ANSI N322-1997
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