Arrow-Tech, Inc. 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 Specifications: Radiation Detected: Gamma and X-Ray from 16 keV to 6 MeV Range: 0-200mR Detector: Fiber-Electrometer mounted in an Electrically Conductive Plastic Ion Chamber Detector Housing: Very low permeability plastics – Hermetically-Sealed Accuracy: /– 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% Dimensions: 4.5” (12.4 cm) Length X .6“ (1.5 cm) Diameter Weight: 1.0 oz. (25 grams) Finish: Natural Matte Gray with a Metal Clip Warranty: Two Year Limited Warranty Shelf Life: 20 Years Specifications: ANSI N13.5 and ANSI N322-1997 Model 909B Dosimeter Charger The Model 909B Charger LED Reading Light reduces re-zeroing time and effort by eliminating the need to remove the dosimeter from the Charger for reading. Simply view the scale while the dosimeter is resting lightly on the charger contact after re-zeroing. Reading in the same orientation as charging also minimizes the effect that gravitational induced fiber movement has on dosimeter accuracy and precision. The Model 909B Charger charging contact is spring-loaded and has a positive mechanical stop. This design feature makes it virtually impossible to damage dosimeters through excessive charging force. Capable of charging any Direct-Reading Dosimeter Conforms to ANSI N42.6-1980 Operates on two 1.5 V “AA” Batteries Has the ability to “Kick” or remove all residual charge from dosimeters properly, which prevents spurious upscale fiber movement LED Reading Light to allow for easy charging/viewing Residual static charge removed for improved accuracy Weight: 10.6 oz.( 302 g) Width: 4” (102 mm) Length: 4” (102 mm) Height: 3.5” (89 mm) Case: ABS Plastic Controls: One-Turn Potentiometer Reading: Spring-Loaded Push Rod Power: 1.5V “AA” Batteries Charging Voltage: 40V to 220V Operating Temperature: 0–120F (-18–49C) Lamp: LED
