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在中子参考辐射场中,室散射会导致仪器指示值升高,与光子辐射场相比,中子辐射场中散射辐射对仪器示值的影响高1~2个数量级,因此中子剂量仪的校准必须考虑散射辐射的影响。按照国际标准ISO8529-2的规定,室散射在任何情况下引起的仪表读数的增加应小于40%。拟计算评估实验室尺寸为7 m×7.3 m×4.75 m,墙体材料为混凝土内衬石蜡,东西墙和南墙混凝土层均为50 cm,北墙混凝土层110 cm,石蜡均为30 cm。为评估该实验室是否满足拟建立的放射性核素中子参考辐
In the neutron reference radiation field, the scattering of the chamber will lead to the increase of the instructed value of the instrument. Compared with the photon radiation field, the influence of scattered radiation in the neutron radiation field on the indication of the instrument is 1 to 2 orders of magnitude higher. Therefore, The calibration must take into account the effects of scattered radiation. In accordance with the international standard ISO8529-2, room scatter in any case caused by the increase in meter readings should be less than 40%. It is planned to calculate the laboratory size of 7m × 7.3m × 4.75m. The material of the wall is concrete with paraffin, concrete wall thickness of 50cm for east wall and south wall, 110cm for north wall concrete wall, and 30cm for paraffin wall. To assess whether the laboratory meets the proposed radionuclide neutron reference radiation