experimental and monte carlo studies on the response of cr-39 detectors to am-be neutron spectrum

نویسندگان

m.r. deevband department of biophysics, tarbiat modares university, tehran, iran

p. abdolmaleki department of biophysics, tarbiat modares university, tehran, iran

m.r. kardan nuclear sciences research school, radiation applications research school, tehran, iran

h.r. khosravi nuclear sciences research school, nuclear sciences and technology research institute, tehran, iran

چکیده

background: the poly-allyl diglycol carbonate (padc) detector is of particular interest for development of a fast neutron dosimeter. fast neutrons interact with the constituents of the cr-39 detector and produce h, c and o recoils, as well as (n, α) reaction. these neutron- induced charged particles contribute towards the response of cr-39 detectors. material and methods: electrochemical etching was used to enlarge track diameter which was made by low energy recoil protons. before electrochemical etching, a chemical etching was performed for 1 hour. the responses were also calculated by monte carlo simulations, using mcnpx code in different energy bins considering h, c and o recoils. the total registered efficiency and partial contributions of the efficiency, due to interactions with each constituent of cr-39, were calculated. results: the optimized condition of etchant was obtained to be 6n koh 15kv.cm-1, and 6 hours etching time. the obtained results show that track efficiency of cr-39 was a function of incident neutron energy. the tracks caused by o and c recoil nuclei were negligible for neutron energies lower than 1 mev. at neutron energies lower than 1 mev, only recoil protons would have sufficient energy to leave visible tracks. but, o and c recoils had important contributions in overall response of padc at neutron energies of few mev. conclusion: the efficiency of a cr-39 based dosemeter could be calculated by mcnpx code and the results were in a good agreement with experimental results in energy range of 241am – be bare source and 241am-be was softened with a spherical polyethylene moderator of radius of 20 cm. iran. j. radiat. res., 2011 9(2): 95-102

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عنوان ژورنال:
iranian journal of radiation research

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