Mishev A L, Kodaira S, Kitamura H, Ploc O, Ambrožová I, Tolochek R V, Kartsev I S, Shurshakov V A, Artamonov A A, Inozemtsev K O
Space Physics and Astronomy Research Unit, University of Oulu, Finland; Sodankylä Geophysical Observatory, University of Oulu, Finland.
Radiation Measurement Research Group, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan.
Sci Total Environ. 2023 Sep 10;890:164304. doi: 10.1016/j.scitotenv.2023.164304. Epub 2023 May 23.
Polar regions are the most exposed to secondary particles and radiation produced by primary cosmic rays in the atmosphere, because naturally they are with marginal geomagnetic shielding. In addition, the secondary particle flux contributing to the complex radiation field is enhanced at high-mountain altitudes compared to sea level because of the reduced atmospheric attenuation. At present, there are very few systematic experimental measurements of environmental dose at high southern latitudes, specifically at high-altitude region. Here, we report a campaign of measurements with different devices, that is passive and Liulin-type dosimeters, of the radiation background at high-mountain Antarctic station Vostok (3488 m above sea level, 78° 27' S; 106° 50' E). We compare the measurements with a Monte Carlo-based model for the propagation of the cosmic rays through the atmosphere and assessment of the radiation field in the atmosphere. We employed the model to estimate the radiation dose at Vostok station during the ground-level enhancement at 28 October 2021. As in previous studies by other teams, we show that the annual dose equivalent at high-altitude Antarctic facilities can significantly exceed the limit of 1 mSv established for the general population by the ICRP.
极地地区最容易受到大气中初级宇宙射线产生的次级粒子和辐射的影响，因为其自然地磁屏蔽作用微弱。此外，由于大气衰减降低，与海平面相比，在高山海拔高度处，对复杂辐射场有贡献的次级粒子通量会增强。目前，在高南纬地区，特别是在高海拔地区，很少有环境剂量的系统实验测量。在此，我们报告了一项使用不同设备（即被动式和柳林型剂量计）在南极沃斯托克高山站（海拔3488米，南纬78°27′；东经106°50′）进行辐射本底测量的活动。我们将测量结果与基于蒙特卡罗方法的宇宙射线在大气中传播及大气辐射场评估模型进行了比较。我们使用该模型估算了2021年10月28日地面增强期间沃斯托克站的辐射剂量。正如其他团队之前的研究一样，我们表明，南极高海拔设施的年剂量当量可能会显著超过国际放射防护委员会为普通人群设定的1毫希沃特的限值。
