Thumbnail
Access Restriction
Open

Author Sathian, Deepa ♦ Rohatgi, Rupali ♦ Jayalakshmi, V. ♦ Marathe, P. K. ♦ Nair, Sarala ♦ Kolekar, R. V. ♦ Chourasiya, G. ♦ Kannan, S.
Source IACS Kolkata
Content type Text
Publisher Indian J. Phys.
File Format PDF
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics
Subject Keyword CR-39 foils ♦ SSNTD ♦ Chemical etching ♦ Fast neutron personnel monitoring ♦ Image analysis system
Abstract CR-39 Solid State Nuclear Track Detecting foils (SSNTD), along with 1 mmthick polyethylene radiator, sealed in triple laminated pouches, are used forcountry wide Fast Neutron Personnel Monitoring in India. With the present system ofprocessing by elevated temperature electrochemical etching (ETECE) and evaluationusing automatic image analysis, only 16 foils are processed at a time and it isuseful over the dose equivalent range 0.2 mSv to 10 mSv. It has been reported that,by processing CR-39 of good detection efficiency by chemical etching at elevatedtemperature, more numbers of foils can be processed simultaneously. In the present study, CR-39 foils from Pershore Moulding (UK) have been chemicallyetched using 7 N KOH under various conditions of temperature and etching durationsand evaluated using high magnification microscope. The duration of chemical etching,has been optimized at a constant temperature of 60°C for chemical etching process.The characteristics of the chemically etched CR-39 foils are compared with thecharacteristics of the CR-39 foils processed by the existing system of ETECE and thedetailed results are presented in the full text of the paper. It has been observedthat by chemical etching process, the dose equivalent range of CR-39 foils can beextended above 60 mSv.
Education Level UG and PG
Learning Resource Type Article
Journal Indian J Phys
Volume Number 83
Issue Number 6
Page Count 7
Starting Page 863
Ending Page 869