Neutron Dose Rate Measurements in J-PARC MLF

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In high energy particle accelerator facilities, high energy neutron contribution to dose is of the great interest as it has significant contribution to the total dose and thus determines the shielding design. The neutron dose rate was measured at Materials and Life Science Facility (MLF) of J-PARC with two types of active detector which can be applied in high energy neutron field: one is the modified type of an ordinary rem meter using a 3He proportional counter with a polyethylene moderator and an additional lead to improve the sensitivity to high energy neutrons, and the other is the phoswitch-type scintillation detector, DARWIN (Dose monitoring system Applicable to various Radiations with WIde energy raNges) which consists of a liquid organic scintillator BC501A coupled with ZnS(Ag) scintillation sheets doped with 6Li, developed in JAEA. Neutron dose rate was measured on the pre-shield of the neutron beam line No.12 (BL12), which is located in the Experimental hall No.1 of MLF, and oriented to backward direction relative to the proton beam of the target station. The neutron spectrum was also measured by DARWIN, and the result showed that the high energy neutrons over 20 MeV had a contribution comparable with those of 1 ∼ 20 MeV.

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