d'Errico F, Alberts W G, Curzio G, Matzke M, Nath R, Siebert B R
Yale University School of Medicine, Department of Therapeutic Radiology, Division of Radiological Physics, 333 Cedar Street, New Haven 06510, CT, USA.
Radiat Prot Dosimetry. 2001;93(4):315-24. doi: 10.1093/oxfordjournals.rpd.a006443.
A directional dose equivalent monitor is introduced which consists of a 30 cm diameter spherical phantom hosting a superheated drop detector embedded at a depth of 10 mm. The device relies on the similarity between the fluence response of neutron superheated drop detectors based on halocarbon-12 and the quality-factor-weighted kerma factor. This implies that these detectors can be used for in-phantom dosimetry and provide a direct reading of dose equivalent at depth. The directional dose equivalent monitor was characterised experimentally with fast neutron calibrations and numerically with Monte Carlo simulations. The fluence response was determined at angles of 0, 45, 90, 135 and 180 degrees for thermal to 20 MeV neutrons. The response of the device is closely proportional to the fluence-to-directional dose equivalent conversion coefficient, h'phi (10; alpha, E). Therefore, our monitor is suitable for a direct measurement of neutron directional dose equivalent, H'(10), regardless of angle and energy distribution of the neutron fluence.
介绍了一种定向剂量当量监测器，它由一个直径30厘米的球形体模组成，体模内嵌入一个过热液滴探测器，探测器位于10毫米深处。该装置基于含卤碳-12的中子过热液滴探测器的注量响应与品质因数加权比释动能因子之间的相似性。这意味着这些探测器可用于体模内剂量测定，并能直接读出深度处的剂量当量。通过快中子校准对定向剂量当量监测器进行了实验表征，并通过蒙特卡罗模拟进行了数值表征。对于热中子到20兆电子伏的中子，在0、45、90、135和180度的角度下确定了注量响应。该装置的响应与注量到定向剂量当量转换系数h'phi(10;α,E)密切成比例。因此，我们的监测器适用于直接测量中子定向剂量当量H'(10)，而与中子注量的角度和能量分布无关。
