design and fabrication of high density borated polyethylene nanocomposites as a neutron shield

نویسندگان

s.m.j. mortazavi department of medical physics and medical engineering, and the center for research in radiation sciences (crrs), shiraz university of medical sciences, shiraz, iran

m. kardan nuclear science and technology research institute, tehran, iran

s. sina department of nuclear engineering, school of mechanical engineering, shiraz university, shiraz, iran

h. baharvand department of polymer chemistry, iran polymer institute, tehran, iran

چکیده

background: polyethylene composites including boron can be used as an effective neutron shield. our investigation focuses on manufacturing borated polyethylene nano-composite. the purpose of this study is to design a radiation shield for use in both neutron and gamma fields. materials and methods: borated polyethylene shields containing 2%, and 5% weight percentage of boron nano-particles were constructed and their neutron attenuation was compared with pure polyethylene. polycarbonate films were used to find the attenuation of am-be neutrons after passing the shields. mechanical properties of the shields were finally compared. results: mean  (± sd) number of α tracks induced by neutrons passing through the shields, were found to be 1.0488×103±128.98,  1.1972×103±289.56and 1.5340×103±206.52 for polyethylene with 5% by weight, polyethylene with 2% by weight boron nano-particles, and pure polyethylene, respectively. the neutron spectrum after each shield was also obtained by mcnp4c monte carlo simulations. on the other hand, borated polyethylene nano-composites showed higher tensile strength compared to that of pure polyethylene. attenuation of neutrons measured in experiments and the result of mcnp simulation were in good agreement. conclusion: a statistically significant difference was found between neutron attenuation by borated polyethylene nanocomposite made of 5% by weight boron and pure polyethylene. however, the difference between borated polyethylene nano-composite with 5% weight and 2% wt boron was not statistically significant.

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عنوان ژورنال:
iranian journal of radiation research

جلد ۱۴، شماره ۴، صفحات ۳۷۹-۳۸۳

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