A new type of 3H surface-contamination monitor.
A new type of 3H surface-contamination monitor has been developed which uses a windowless air proportional counter as the detector. The monitor offers several advantages. First, a high detection efficiency is obtained for 3H beta rays due to the windowless construction of the detector, permitting a minimum detection level of less than 10(-4) muCi cm-2 for surface contamination by 3H. Second, since no special gases other than room air are used as the counter gas, gas cylinders are not required thereby permitting increased convenience and lower costs. Finally, the detector is insensitive to external light due to the height discrimination of proportional counter pulses, which allows the monitor to be used in brightly illuminated places.
D001610:Beta Particles; D007753:Laboratories; D011834:Radiation Monitoring / Q000295:instrumentation*; D014316:Tritium / Q000032:analysis*
D014316:Tritium