Spurny F, Ploc O, Dachev T
Department of Radiation Dosimetry, Nuclear Physics Institute AS CR, Na Truhlárce 39/64, 180 86 Praha 8, Czech Republic.
Radiat Prot Dosimetry. 2007;126(1-4):519-23. doi: 10.1093/rpd/ncm104. Epub 2007 May 12.
The neutron contribution to the spacecraft crew exposure could represent an important part of the total dose equivalent value. The determination of this contribution represents a rather complex and difficult task, both through experimental and theoretical estimation. This paper will present an attempt to determine the neutron contribution onboard the International Space Station and Foton capsule using the data measured by means of a Si-diode based energy deposition spectrometer. As such a spectrometer, the MDU-Liulin equipment, developed in one of our laboratories was used. The equipment allows the data accumulated during the passage in or out of the South Atlantic Anomaly (SAA). In this paper, only the data obtained out of the SAA were analysed, assuming that the neutron spectra are similar to those onboard aircraft and/or at the CERF high-energy radiation field. The excess of deposited energy in the region above 1 MeV, when comparing with the aircraft field, was expected to represent the primary high-energy charged particles. Total dosimetry characteristics obtained in this way are in reasonable agreement with other data, neutron contribution representing approximately 40% of the total dose equivalent for the flight duration outside of the SAA.
中子对航天器乘员暴露的贡献可能占总剂量当量值的重要部分。通过实验和理论估算来确定这一贡献是一项相当复杂且困难的任务。本文将尝试利用基于硅二极管的能量沉积谱仪所测得的数据，来确定国际空间站和“光子”号太空舱上的中子贡献。作为这样一种谱仪，我们实验室研制的MDU - 柳林设备被加以使用。该设备能记录在进出南大西洋异常区（SAA）期间积累的数据。在本文中，仅对在南大西洋异常区之外获取的数据进行了分析，假设中子能谱与飞机上以及/或者欧洲核子研究中心（CERF）高能辐射场的能谱相似。与飞机辐射场相比，在1兆电子伏以上区域沉积能量的过量部分预计代表主要的高能带电粒子。以这种方式获得的总剂量学特征与其他数据合理吻合，在南大西洋异常区之外的飞行期间，中子贡献约占总剂量当量的40%。
