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目的为了评估飞行高度与纬度对民航机组人员飞行中所受电离辐射剂量水平的影响。方法在北纬20°－61°的不同航线的11个机场上空以RSS－111高压电离室测量宇宙辐射电离成分的剂量率。结果宇宙辐射电离成分剂量率随飞行高度的增加而呈指数型增大，并随纬度增大而增加；在同一飞行高度，随地磁纬度的增大而呈直线。增加。根据所测数据，许算出我国空域不同经纬度地区上空不同飞行高度分配层的宇宙辐射电离成分剂量率。结论在民航现有航线（从北纬61°到南纬40°）上，按现有的飞行高度分配层（一般在12km以下）飞行，机组人员每年飞行1000h所接受的宇宙辐射剂量要小于国际放射防护委员会（ICRP）建议的20mSv／a（5年平均值）剂量限值。
Purpose To assess the effect of flight altitude and latitude on ionizing radiation dose levels experienced by civil aviation crews in flight. Methods The dose rate of the cosmic radiation ionization component was measured by RSS-111 high voltage ionization chamber over 11 airports on different routes with latitude 20 ° -61 ° north latitude. Results The dose rate of cosmic radiation ionization component increased exponentially with the increase of flight altitude and increased with the increase of latitude. At the same flight altitude, the dose rate of ionizing radiation increased with the increase of geomagnetic latitude. increase. Based on the measured data, we can calculate the dose rate of cosmic radiation ionization component of different flight altitude distribution layers in different regions of airspace in China. Conclusions In the existing civil aviation routes (from latitude 61 ° north to latitude 40 ° south), the flight doses for the flight crew accepted at 1,000 h per year are less than those for international radiations at the existing flight altitude distribution level (generally below 12 km) The 20mSv / a (5-year average) dose limit recommended by the ICRP.