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ORIGINAL ARTICLE
Year : 2016  |  Volume : 39  |  Issue : 2  |  Page : 91-95

Response of CaSO4:Dy based thermo luminescence dosimeter badge to 137Cs and 60Co radiations and its implications on estimation of personal dose equivalent


TLD-Personnel Monitoring and Services Section, Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, CT and CRS, Anushaktinagar, Mumbai, Maharashtra, India

Correspondence Address:
C Sneha
TLD-Personnel Monitoring and Services Section, Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, CT and CRS, Anushaktinagar, Mumbai - 400 094, Maharashtra
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-0464.190392

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In view of an underestimation of personal dose equivalent due to 60 Co radiation when system is calibrated to 137 Cs, the effect of the atomic number of the filters used in the badge on the photon beams of 660 keV and 1250 keV was investigated. The low Z-high Z interface created between filters and discs was found to lead to discontinuity in dose at the surface of the disc. This effect was consistently observable due to the 0.8 mm thickness of the disc. It was concluded that under-estimation of dose due to 60 Co radiation could be avoided by either reducing the thickness of the dosimeter disc or by a slight modification in the design of the filters.


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