Model AT-138

Pencil Dosimeter

Part Number: 51-2936

Features

• Sensitive to Gamma and X-ray
• 0 to 200 mR
• Lightweight
• Hermetically Sealed
• Sturdy Pocket Clip
• Meets ANSI N13.5 & N322-1997
• Responds Well to Fast Pulse X-Rays
• Low Leakage, Measures Background

This direct reading dosimeter is a ruggedly constructed precision instrument for measuring and reading accumulated dose of gamma and X-ray radiation exposure up to 200 mR. Applications include personal and environmental monitoring. The low-energy feature has hospital applications including fluoroscopy, portable radiography, and angiography. A hardened sapphire end window provides clean, scratch-proof viewing of measurements. This pocket-sized instrument is lightweight and has a sturdy clip to attach to an individual's pocket for constant use and ongoing protection.

To ensure accurate readings, the AT-138 must be zeroed before use with a dosimeter charger, such as the AT-909 or The Charger (see the Options tab below for more information).

• Specifications
• Options
• Documents

• Specifications
• Options
• Documents

Specifications

Range	0 to 200 mR
Energy Response	16 keV to 2 MeV
Radiation Detected	Gamma and X-ray from 16 keV to 6 MeV
Detector	Fiber electrometer mounted in an electrically conductive plastic ion chamber
Detector Housing	Very low permeability plastic, hermetically sealed
Accuracy	Within 10% of true exposure
Rate Response	Dose rate independent for gamma and X-ray radiation
Electrical Leakage	Less than 1.0% of full scale for 24 hours at 50 °C (122 °F)
Temperature Range	-20 to 50 °C (-4 to 122 °F)
Relative Humidity	Up to 90%
Finish	Barrel and End Caps	Natural matte black
	Clip	Color coded plastic (color signifies range) or metal clip
Size (D x L)	1.5 x 12.4 cm (0.6 x 4.5 in.)
Weight	25 g (1.0 oz)
Warranty	2 year limited warranty
Qualifications	Meets ANSI Specifications N13.5 and N322-1997

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Options

Option	Description	Part Number
Model AT-909	Charger for direct reading pocket dosimeters.	51-2938
The Charger	Charger with a piezoelectric generator for quartz and carbon fiber dosimeters.	51-2940
Dosimeter Light	LED light that attaches to dosimeter permitting it to be read in low-light conditions.	51-2956

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Documents

• Data Sheet

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