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 • Superior Response: 16 KeV to 2 MeV
• Rugged: Meets ANSI Specifications N13.5 and N322
• Low Leakage - Measures Background N13.5 and N322
The direct reading dosimeter is a rugged instrument which measures accumulated quantities of gamma and x-ray radiation. Applications include personal and environmental monitoring. The low energy feature has hospital applications including flouroscopy, portable radiography, and angiography. This pocket size instrument is lightweight, and has a sturdy clip to attach to individual’s pocket. The entire unit can be immersed in water without effecting the instrument readings.
A conductive fiber dosimeter is a rugged precision instrument consisting of an ionization chamber sensitive to radiation; a conductive fiber electrometer to measure the charge; and a microscope to read the shadow of the fiber on a reticle.
The electrometer embodies two electrodes, one of which is a moveable conductive fiber. When the electrometer is charged to a predetermined voltage, the electrodes assume a calibrated separation.
As the dosimeter is exposed to radiation, ionization occurs in the surrounding chamber decreasing the charge on the electrodes in proportion to the exposure. The deflection of the moveable conductive fiber electrode is projected, by a light source, through an objective lens to the calibrated reticle and read through a microscope eyepiece.
Illumination for the optical system is obtained by pointing the dosimeter at any convenient light source. Light passes through the clear plastic electrostatic shield to illuminate the reticle.
The bottom is sealed by the clear plastic diaphragm switch containing an insulated charge pin. When charging, the charging pin moves up to contact the electrometer closing the circuit. Sufficient voltage is applied to recharge the system.
The entire system is encased in a liquid crystal polymer (LCP) barrel with all joints hermetically sealed with epoxy.
Items 343-490 thru 343-505 are available with a protective hard window which prevents the lens from being scratched. Other items can be ordered with this feature also.
These dosimeters may be used repeatedly by resetting to zero with the dosimeter charger (Item 343-750) after the accumulated exposure has been recorded in a log.
Specifications
Radiation Detected: Gamma and x-ray from 16 keV to 2 MeV
Ranges: 0-200 mR to 0-200 R
Detector: Fiber electrometer mounted in an electrically conducting plastic ion chamber.
Detector Housing: Very low permeability plastics - hermetically sealed
Accuracy: Within ± 10% of true exposure
Rate Response: Dose rate independent for gamma and x-radiation
Electrical Leakage: Less than 0.5% of full scale for 24 hours at 50 degrees C.
Temperature Range: -20° C to + 50° C
Relative Humidity: Up to 90%
Dimensions: Length: 4.5”, Diameter: 0.6”
Weight: 1.0 oz.
Finish: Barrel and end caps: Natural matte black
Clips: Metal
Warranty: 2 year limited warranty
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