Radiation detected: Alpha above 7.5 MeV, Beta above 100 keV, and Gamma above 7 keV
Operating ranges:
0 to 5 mR/h or 0 to 50 μSv/h
0 to 50 mR/h or 0 to 500 μSv/h
0 to 500 mR/h or 0 to 5 mSv/h
0 to 5 R/h or 0 to 50 mSv/h
0 to 50 R/h or 0 to 500 mSv/h
Accuracy: Within 10% of reading between 10% and 100% of full scale indication on any range, exclusive of energy response. Calibration source is 137Cs
Detector:
Chamber: 349 cc volume air ionization
Chamber wall: 246 mg/cm2 thick phenolic
Chamber window: 6.6 mg/cm2 Mylar, protected by steel mesh, 46 cm2 detection are
Beta slide: 440 mg/cm2
451B-DE-SI: In order to achieve energy response consistent with measurements of H*(10) as required by ICR4-47, aluminum has been added to the back wall, 38% of the side wall area, and to the beta slide. With the Beta Shield open, the 451B can measure skin dose at 10* (0.07), and Deep Dose H* (10) with Beta shield closed.
Controls: ON/OFF and MODE
Automatic Features: Auto-zeroing, auto-ranging, and auto-back
Warm-up time: One minute
Modes:
Integrate mode: Operates continuously 30 seconds after the instrument has been turned on. Integration is performed even if the instrument is displaying in mR/h or R/h
Freeze mode:Will place a tick mark on the bar graph display to hold on the peak displayed value. The unit will continue to read and display current radiation values
