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引用次数: 0
摘要
在标准单能 ISO 中子场中,为了比较两种产量,对产生中子反应的中子产量和瞬时光子产量(包括高达 10 兆电子伏的光子能量)进行了测量。采用飞行时间法将目标产生的光子(直接光子)与二次中子反应产生的光子分开。根据测得的光谱能量分布计算出光子和中子的环境剂量当量。需要准单能量中子场来系统地测试测量仪器对中子辐射的反应。为此,国际标准化组织(ISO)定义了一系列参考中子辐射场,其能量范围广泛,最高可达 19 MeV。由于中子探测器也可能受到光子辐射的影响,因此必须了解 ISO 中子场中的光子通量。这项工作的重点是能量范围从 24 keV 到 19 MeV 的准单能加速器产生的中子场。
Quantitative investigation of gamma radiation in accelerator produced ISO neutron fields.
In standard monoenergetic ISO neutron fields, the neutron yield of neutron-producing reactions was measured in combination with the prompt photon yield, including photon energies up to 10 MeV, for the purpose of comparing the two yields. Separating the photons produced by the target (direct photons) from those generated by secondary neutron reactions was achieved using the time-of-flight method. Photon and neutron ambient dose equivalent values were calculated from measured spectral energy distributions. Quasi monoenergetic neutron fields are needed to systematically test the response of measuring instruments to neutron radiation. For this reason, ISO has defined a number of reference neutron radiation fields covering a wide energy range up to 19 MeV. Because neutron detectors may also be affected by photon radiation, the photon fluence in the ISO neutron fields has to be known. This work focuses on quasi monoenergetic accelerator-produced neutron fields in the energy range of 24 keV to 19 MeV.
期刊介绍:
Journal of Radiological Protection publishes articles on all aspects of radiological protection, including non-ionising as well as ionising radiations. Fields of interest range from research, development and theory to operational matters, education and training. The very wide spectrum of its topics includes: dosimetry, instrument development, specialized measuring techniques, epidemiology, biological effects (in vivo and in vitro) and risk and environmental impact assessments.
The journal encourages publication of data and code as well as results.