Investigation of shielding properties of NBR sheet used as sealant layer for TRR diffractometer main shield

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عنوان دوره: اولین دوره بین المللی و بیست و هشتمین دوره ملی (1400)
New nitrile butadiene rubber (NBR) materials are being considered to use for neutron shielding. Such light and siuable material could be used for sealing of the gaps or even for shielding of low radiation environments. In the present work, theoritically and experimentally investigation of NBR shielding effects for neutrons was proposed. MCNPX code was used to simulate the main shield of Tehran research reactor (TRR) while NBR layer was used as sealing for the gaps between the reactor wall and the main shield. The NBR damage also was investigated using the material irradiation inside the TRR core for 24 h. The obtained results showed desirable stability of NBR in high neutron fluences. Simulation data showed by 2 cm NBR layer between main shield of TRR diffraction facility and the reactor concrete wall, the neutron dose rate would be decreased up about 20%. Also the measured data showed NBR layer could decrease the neutron dose rate about 31%.
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