Characterisation of proton irradiated CR-39 detector using positron annihilation lifetime spectroscopy

Characterisation of proton irradiated CR-39 detector using positron annihilation lifetime spectroscopy

The damaged produced by proton beam slowed down in CR-39 polymer results in highest degree of disorder with change of free volume proprieties. Positron annihilation lifetime spectroscopy (PALS) is nowadays well recognized as powerful tool of microstructure investigations. PALS is used in order to ge...

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Bibliographic Details
Published in:Radiation measurements Vol. 50; pp. 26 - 30
Main Authors: Lounis-Mokrani, Z., Guittoum, A., Imatoukene, D., Aitziane, M., Badreddine, A., Mebhah, M.
Format: Journal Article Conference Proceeding
Language:English
Published: Kidlington Elsevier Ltd 01-03-2013
Elsevier
Subjects:
CR-39
Earth sciences
Earth, ocean, space
Exact sciences and technology
Free volume
Geochronology
Isotope geochemistry. Geochronology
PALS
Proton
SOBP
Proton
Free volume
CR-39
SOBP
PALS
detection
spectroscopy
microstructures
protons
polymers
irradiation
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Summary:The damaged produced by proton beam slowed down in CR-39 polymer results in highest degree of disorder with change of free volume proprieties. Positron annihilation lifetime spectroscopy (PALS) is nowadays well recognized as powerful tool of microstructure investigations. PALS is used in order to get more information at an atomic scale of modifications induced by irradiation of polymers particularly the variation of free volume in the irradiated region. In this paper, the mean free volume hole radii and average free volume of the micro-voids in CR-39 polymer irradiated with 200 MeV therapy proton beam at different positions in spread out Bragg Peak region (SOBP) at Ithemba proton therapy facility have been determined using PALS. © 2006 Elsevier Ltd. All rights reserved. ► PALS is useful tool to study radiation effect on CR-39 Polymer. ► Irradiations were performed with 200 MeV proton beam at the SOBP region. ► Small decrease in o-Ps lifetime shows reduction of free volume in irradiated CR-39. ► This reduction indicates the facilitation of cross linking in the damaged region. ► Distribution of deposited energy per unit volume is not uniform at the SOBP region.
ISSN:1350-4487
1879-0925
DOI:10.1016/j.radmeas.2012.10.007