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ORIGINAL ARTICLE
Year : 2018  |  Volume : 41  |  Issue : 2  |  Page : 70-76

Development of a combination detector system for simultaneous measurement of α and β/γ radioactivity


1 Radiation Safety Systems Division, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India
2 Department of Physics, Nowrosjee Wadia College, Pune, Maharashtra, India

Correspondence Address:
Mrs. Vaishali Manojkumar Thakur
Radiation Safety Systems Division, Bhabha Atomic Research Centre, Trombay, Mumbai - 400 085, Maharashtra
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/rpe.RPE_26_18

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Accurate estimation of radioactivity content of various samples and effluents is essential in all stages of operation at a nuclear facility. Generally, two separate systems are used for estimation of α and gross β activity. A single counting setup with a detector probe consisting of a combination of ZnS (Ag) and plastic scintillator detectors can be applied for this purpose. This paper describes design, development, and characterization of a combination detector system for simultaneous assessment of α and β/γ radioactivity content of an electrodeposited or planchetted sample or that of a filter paper. Pulse height discrimination technique has been utilized to distinguish between α and β radiations. The β activity counts had been observed to contribute <0.7% in α activity. Counts from α activity are added up in β channel counts, and it was observed that for 239Pu source, it is about 2.5 times. Efficiency of the system for β sources was found to have varied from about 14% (137Cs) to 23% (90Sr/90Y). The efficiency for 238Pu α source was found to be 13.4%.


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