[논문]Validation of KREAM Based on In-Situ Measurements of Aviation Radiation in Commercial Flights

Hwang, Junga; Kwak, Jaeyoung; Jo, Gyeongbok; Nam, Uk-won

doi:10.5140/jass.2020.37.4.229

Validation of KREAM Based on In-Situ Measurements of Aviation Radiation in Commercial Flights 원문보기

Journal of astronomy and space sciences, v.37 no.4, 2020년, pp.229 - 236

Hwang, Junga (Korea Astronomy and Space Science Institute) , Kwak, Jaeyoung (Korea Astronomy and Space Science Institute) , Jo, Gyeongbok (Department of Astronomy and Space Science, Chungnam National University) , Nam, Uk-won (Korea Astronomy and Space Science Institute)

Abstract ▼ AI-Helper

There has been increasing necessity of more precise prediction and measurements of aviation radiation in Korea. For our air crew and passengers' radiation safety, we develop our own radiation prediction model of KREAM. In this paper, we validate the KREAM model based on comparison with Liulin observations. During early three months of this year, we perform total 25 experiments to measure aviation radiation exposure using Liulin-6K in commercial flights. We found that KREAM's result is very well consistent with Liulin observation in general. NAIRAS shows mostly higher results than Liulin observation, while CARI-6M shows generally lower results than the observations. The percent error of KREAM compared with Liulin observation is 10.95%. In contrast, the error for NAIRAS is 43.38% and 22.03% for CARI-6M. We found that the increase of the altitude might cause sudden increase in radiation exposure, especially for the polar route. As more comprehensive and complete analysis is required to validate KREAM's reliability to use for the public service, we plan to expand these radiation measurements with Liulin and Tissue Equivalent Proportional Counter (TEPC) in the near future.

주제어

표/그림 (8)

표 Table 1. Summarized fight information for aviation route dose measurements
표 Table 2. Route dose, averaged dose rate, maximum altitude, and maximum latitude measured by Liulin-6K depending on continents
그림 Fig. 1. Averaged effective dose rate with maximum altitude and maximum latitude for a total of 25 flights.
그림 Fig. 2. Comparison between Liulin observation data (green) and KREAM result (red) for three return flights. Dashed lines indicate the altitude profile (black). (a) April 25, 2020, ATL–ICN, (b) May 1, 2020, FRA–ICN, (c) May 20^th, 2020, SGN–ICN.
표 Table 3. Comparison between Liulin observation data and prediction model data of NAIRAS, CARI-6M, and KREAM
그림 Fig. 3. (a) comparison of total effective dose for 25 flights between Liulin data and three different models of NAIRAS, CARI-6M, and KREAM, (b) percent error (%) between observation and each model.
그림 Fig. 4. Flight routes over the polar route corresponding to the 4^th (a) and the 14^th (b) are in Table 3. The color indicates an altitude, and the black line indicates the extrapolated altitude profile due to missing data.
그림 Fig. 5. Comparison between Liulin data and three models of NAIRAS CARI-6Mm and KREAM for two polar routes corresponding to the flights of Fig. 4.

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문제 정의

In this paper, we compare the in-situ measurements by using Liulin-6K equipment at the commercial flights with KREAM results to validate the reliability of our aviation radiation prediction model KREAM. We also compare the measurements with the other two models of CARI-6M and NAIRAS.

대상 데이터

Most flights start from or return to Incheon airport (ICN). The flights cover various continents of North America, South-east Asia, Australia, Russia, and Europe. Flight times are written in Universal Time (UT).

성능/효과

Consequently, KREAM values show the lowest error in 19 cases out of 25 cases, while CARI-6M and NAIRAS are closest to Liulin value in five cases and only one case, respectively. KREAM values show over 20% error in just 4 cases, and the maximum error is 29%, which is under 30%.
NAIRAS values are much higher than Liulin data. It is clear that there is a general tendency; NAIRAS produces the highest values, Liulin/KREAM has median values, and CARI-6M makes the lowest values.

후속연구

We found that the increase of the altitude might cause sudden increase in radiation exposure, especially for the polar route. As more comprehensive analysis is required to validate KREAM’s reliability, we plan to expand these radiation measurements with Liulin and TEPC in the near future.
The Counter’s chamber is filled with methane or propane-based tissue-equivalent gas. Further experiments using our TEPC are planned to be carried out soon.

참고문헌 (15)

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