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Author Rohatgi, Rupali ♦ Sathian, Deepa ♦ Jayalakshmi, V. ♦ Nair, Sarala ♦ Marathe, P. K. ♦ Chaurasiya, 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 ♦ SSNTD ♦ Fast neutron monitoring ♦ Chemical pre-etching ♦ Sensitivity
Abstract Presently, CR-39 Solid State Nuclear Track Detectors (SSNTD) is beingused for Fast Neutron Personnel Monitoring in India. Individual detectors are cutmanually from CR-39 sheets. Laser-cutting of the sheets will ensure precision andalso save on the laborious efforts involved in sheet cutting. It was observed thatthere is a slight increase in background tracks due to laser-cutting. Studies werecarried out on the effect of chemical pre-etching at higher temperatures inproperties of CR-39 such as the background, sensitivity and minimum measurable dose.For this purpose a pre-etch step was included in the normal processing of the CR-39foils in an elevated temperature electrochemical cell (ETECE cell) and the durationfor pre-etch step at elevated temperature was optimized. Samples of CR-39 exposed to dose equivalents ranging from 1 mSv to 10 mSv usingAm-Be neutron source were processed by both the methods, under normal processingusing ECE cell and in the optimized chemical pre-etch followed by normal processing.The dose responses of CR-39 processed by both methods are compared in this paper.
Education Level UG and PG
Learning Resource Type Article
Journal Indian J Phys
Volume Number 83
Issue Number 6
Page Count 6
Starting Page 845
Ending Page 850