STACK GAS MONITORING

Stack Gas Monitor, Type: SM809 manufactured by Nucleonix Systems, designed using state-of-art electronics is primarily used for monitoring Alpha, Beta activity present in the form of suspended particulate in air and Kr-85 preset in the form of gas. It is very much essential to monitor the quality of air in & around Radiochemical plants, reprocessing plants and other similar facilitates. Usually stack, by pass lines are let into this system & after measurements, it is connected back to stack.
It essentially has an air suction system comprising of a suction pump, rotometers to measure air flow rate, beta suction chamber with arrangement for trapping of suspended dust particulate onto the filter paper. An end window GM tube of 1� dia facing the filter paper counts for Beta activity in CPM CPSBq on continuous basis.
In addition this system has Alpha air-sampler detector assembly consists of a filter holder 60mm dia, a suction chamber with air inlet and outlet & detector housing fabricated with stainless steel .Alpha Detector consists of ZnS (Ag) deposited on loose mylar support of 50mm dia coupled to matched PMT with Pre-amplifier. Detector Efficiency achieved is of the order of 25% for Plutonium alpha particles over the entire window area.