Effects of radiations on the characteristics of alpha and fission tracks in CR-39 detectors
作者:
A.K. Pandey,
R.C. Sharma,
S.K. Padalkar,
P.C. Kalsi,
R.H. Iyer,
期刊:
Radiation Effects and Defects in Solids
(Taylor Available online 1994)
卷期:
Volume 129,
issue 3-4
页码: 335-343
ISSN:1042-0150
年代: 1994
DOI:10.1080/10420159408229032
出版商: Taylor & Francis Group
关键词: Alpha and fission tracks;CR-39 detectors;etch rates;doping with diotcyl phthalate;thermal neutrons;reactor neutrons
数据来源: Taylor
摘要:
The effects of neutron, gamma and alpha radiations on the alpha and fission fragment tracks registration and revelation properties of CR-39 detectors (CR-39 and CR-39(DOP) were studied. It was found that the ratio of the bulk etch rate of irradiated to unirradiated (VG(irr.)/VG(unirr.) detectors is linearly dependent on dose. An exponential decrease in fission track densities with increase in neutron fluence was observed. The ratio of VG(irr.)/VG(unirr.) was found to be high in CR-39 than that in CR-39(DOP) exposed to the same reactor neutron fluence. The decrease in fission track densities with increase in neutron fluence was observed to be faster in CR-39 than in CR-39(DOP). This indicates that doping with dioctyl phthalate improves the radiation resistance of CR-39 detectors. It was observed that in detectors exposed to an alpha flux of the order of 9.36 × 106/ cm2, the fission track density was reduced by 11% and thereafter it remained constant. The results also indicate that thermal neutron fluence up to 7.01 ×1011neutrons/cm2does not affect the alpha and fission track densities. I.R. spectra were also studied to find out the nature of chemical changes produced by these radiations on CR-39.
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