Nakamura T, Uwamino Y, Ohkubo T, Hara A
Cyclotron and Radioisotope Center, Tohoku University, Sendai, Japan.
Health Phys. 1987 Nov;53(5):509-17. doi: 10.1097/00004032-198711000-00008.
The altitude variation of the cosmic-ray neutron energy spectrum and the dose equivalent rate was measured at an average geomagnetic latitude of 24 degrees N by using the high-efficiency multi-sphere neutron spectrometer and neutron dose-equivalent counter developed by the authors. The data were obtained from a 2-h flight over Japan on 27 February 1985. The neutron energy spectra measured at sea level and at altitudes of 4,880 m and at 11,280 m were compared with the calculated spectra of O'Brien and with other experimental spectra, and they are in moderately good agreement with them. The dose equivalent rate increases according to a quadratic curve up to about 6,000 m and then increases linearly between 6,000 m and 11,280 m. The dependence of dose equivalent rates at sea level and at an altitude of 12,500 m on geomagnetic latitude also is given by referring to other experimental results.
利用作者研制的高效多球中子谱仪和中子剂量当量计数器，在平均地磁纬度北纬24度处测量了宇宙线中子能谱和剂量当量率的海拔变化。数据取自1985年2月27日在日本上空进行的一次两小时飞行。将海平面、4880米和11280米海拔处测得的中子能谱与奥布赖恩计算的能谱以及其他实验能谱进行了比较，它们与这些能谱的吻合程度适中。剂量当量率在约6000米高度之前按二次曲线增加，然后在6000米至11280米之间呈线性增加。还参考其他实验结果给出了海平面和12500米高度处剂量当量率随地磁纬度的变化关系。
