Badhwar G D, Konradi A, Braby L A, Atwell W, Cucinotta F A
NASA Johnson Space Center, Houston, TX 77058.
Radiat Prot Dosimetry. 1994;52(1-4):439-45.
Two new charged particle detectors have been flown in five recent Shuttle flights. The tissue-equivalent proportional counter measures the lineal energy spectrum of space radiation in the 0.26-300 keV micrometer-1 range. The charged particle spectrometer is a double dE/dx x E and dE/dx x Chrenekov detector system which provides a measurement of the differential energy spectrum of protons from 13 to 350 MeV and dose rate in silicon. In this paper the dose rate, equivalent dose rate, and radiation, quality factor for trapped protons and cosmic radiation are reported on separately. A comparison of the integral LET spectra with recent transport code calculations shows significant disagreement. Using the calculated dose rate from the omnidirectional AP8MAX model with IGRF reference magnetic field epoch 1970, and observed dose rate as a function of geographic latitude and longitude, the westward drift of the south Atlantic anomaly has been determined. The east-west effect has also been studied and a 'second' radiation belt observed. A comparison of the galactic cosmic radiation (GCR) lineal energy transfer spectra with model calculations shows disagreement comparable with those of the trapped protons.
最近的五次航天飞机飞行搭载了两台新型带电粒子探测器。组织等效正比计数器测量0.26 - 300 keV·μm⁻¹范围内空间辐射的线能量谱。带电粒子谱仪是一个dE/dx×E和dE/dx×切伦科夫双探测器系统，可测量能量范围为13至350 MeV的质子微分能谱以及硅中的剂量率。本文分别报告了俘获质子和宇宙辐射的剂量率、当量剂量率以及辐射品质因数。积分传能线密度谱与近期输运代码计算结果的比较显示出显著差异。利用具有1970年国际地磁参考场（IGRF）参考磁场历元的全向AP8MAX模型计算的剂量率以及作为地理纬度和经度函数的观测剂量率，确定了南大西洋异常区的向西漂移。还研究了东西效应并观测到了“第二”辐射带。银河宇宙辐射（GCR）线能量转移谱与模型计算结果的比较显示出与俘获质子的差异相当。
