Measurement and analysis of neutron and photon dose rate in concrete shield of 120-GeV proton accelerator facility

Le résumé fourni par la source

The dose rate measurements of neutrons and photons by using dosimeter (Quixel badge) have been performed in the concrete shield at the 120 GeV anti-proton production facility (AP0) in Fermi National Accelerator Laboratory.The concrete shield was established backward of 183 cm thick iron shield.The thickness of the concrete shield was 122 cm.The dosimeters were set in the concrete shield at 0, 15, 30, 45, 60, 90 and 120 cm from the front surface.The proton beam intensities varied from 2.40x10 12 to 5.18x10 17 (protons/sec) according to the sensitiveness of the dosimeters.The calculations of dose rate in the concrete shield have also been performed by using PHITS-2.24calculation code with its related cross section library JENDL3.3.From the comparisons between measured and calculated results, good agreements within factor 2 were obtained in the case of photons.However, some disagreements were observed in the case of neutrons, especially near the front surface up to 15 cm.These discrepancies might be caused by the estimation of neutron dose rate and/or detector resolution around 100 keV.

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