| Fan Shengnan,Zhao Yu,Xiao Hong,et al.Analysis of measured neutron ambient dose equivalent on typical flight routes in China[J].Chinese Journal of Radiological Medicine and Protection,2026,46(2):121-128 |
| Analysis of measured neutron ambient dose equivalent on typical flight routes in China |
| Received:July 07, 2025 |
| DOI：10.3760/cma.j.cn112271-20250707-00228 |
| KeyWords:Aircrew Neutron radiation dose Ambient dose equivalent rate Cosmic radiation |
| FundProject: |
| Author Name | Affiliation | E-mail | | Fan Shengnan | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute of Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Zhao Yu | Radiation Safety Institute, Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, China | | | Xiao Hong | Shanghai Municipal Center for Disease Control and Prevention (Shanghai Academy of Preventive Medicine), Department of Radiation Protection in Division of Health Risk Factors Monitoring and Control, Shanghai 200336, China | | | Zhang Yu | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute of Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Li Mengxue | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute of Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Hu Xiaoqin | Shanghai Airlines Co., Ltd. Aviation Sanitation Division, Shanghai 201100, China | | | Deng Jun | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute of Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | dengjun@nirp.chinacdc.cn | | Chen Qingfeng | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute of Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Sun Quanfu | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute of Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | |
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| Abstract:: |
| Objective To measure and analyze the neutron ambient dose equivalent on some domestic flight routes, in order to provide data support for developing a cosmic radiation dose estimation tool and improving the health management system for aircraft crew. Methods This study selected 24 routes for measurement purpose, 23 with Beijing Capital International Airport as both the departure and arrival airport and one from Shenzhen to Shenyang for measurement. The FHT762-WENDI2 detector was used to measure the neutron ambient dose equivalent rate at flight altitude, with flight parameters on flight altitude, latitude, longitude, and flight duration collected in real time. The measured results were compared with the CARI-7A calculated values to verify the accuracy of the measurements. Additionally, based on stepwise regression analysis, the optimal regression model for use in analyzing neutron ambient dose equivalent was established. And the annual effective doses were estimated based on the maximum cumulative flight time of aircraft crew in a year as stipulated in the relevant national standard. Results Measurements were conducted along 24 flight routes crossing 14 cities in China. It was found that the average neutron ambient dose equivalent rate ranged from 0.20 to 1.30 μSv/h, with the neutron ambient dose equivalent on the routes ranging from 0.21 to 7.40 μSv. The average relative deviation between the measured valules and the CARI-7A calculated values was approximately 14.65%, indicating a good consistency between the two. The findings reveal that flight duration and cruising altitude were the most statistically significant factors, followed by the departure latitude and destination latitude. Except for four short-haul routes, the annual cosmic radiation dose received by pilots and flight attendants on the remaining 20 routes all exceeded the public annual dose limit (1 mSv). Conclusions The neutron ambient dose equivalent on flight routes is positively correlated with flight time, average cruising altitude and flight latitude. The radiation risk to the aircraft crew on high-latitude and high-altitude routes is significantly higher than those on other routes. In addition, the cumulative doses may be relatively high for crew members who fly either frequently or on polar routes. Therefore, it is still necessary to strengthen the monitoring and regulatory control of radiation doses to aircrew. |
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