Area radiation detector 940-7

for the pharmaceutical industryfor healthcare facilitiesbenchtop

The 940-7 Duct Monitor is a single-channel Geiger-Mueller (GM) area radiation monitoring system capable of operating over the range of 10-2 to 103 mR/h. The system monitors gamma radiation over a 5-decade range and provides indication when the radiation level decreases below a fail threshold, exceeds a warn set point, exceeds a high set point or exceeds an overrange set point. Key Features Range: 5 decades between 10-2 and 103 mR/h Energy response: 15% from 80 keV to 1.5 MeV No external power needed at detector location Preamplifier integral with detector Ratemeter may be remotely located up to Single cable between ratemeter and detector 8 µCi 36Cl check source Life expectancy: up to 105 rads Replaces high maintenance off-line monitoring system Class IE qualified NRC approved The over-range feature provides two significant benefits. First, it prevents the system from displaying an on-scale, but inaccurate, reading should the detector become saturated. Second, it lessens the risk of damaging the detector by disabling it during an over-range condition. Relay outputs are available to activate alarm annunciators. Analog outputs are available for trend display on a strip chart recorder or computer. In addition, the monitoring system has an integral isotopic check source to verify operational integrity. The system consists of a Model 897A series GM detector with integral preamplifier and the Model 956A Universal Digital Ratemeter (UDR). The detector is bolted to a mounting flange that matches the contour of the exhaust duct.