보고서 정보
주관연구기관 |
한국원자력안전기술원 Korea Institute of Nuclear Safety |
보고서유형 | 최종보고서 |
발행국가 | 대한민국 |
언어 |
한국어
|
발행년월 | 2014-12 |
과제시작연도 |
2007 |
주관부처 |
미래창조과학부 Ministry of Science, ICT and Future Planning |
과제관리전문기관 |
한국원자력안전기술원 Korea Institute of Nuclear Safety |
등록번호 |
TRKO201500010877 |
과제고유번호 |
1355052138 |
사업명 |
한국원자력안전기술원 |
DB 구축일자 |
2015-07-18
|
키워드 |
인공방사성핵종.해양방사능조사.해양환경조사.해수.어류.패류.해조류.해저퇴적물.
|
초록
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우리나라 주변 해역에서 해수, 해양생물, 해저퇴적물의 시료 중 방사능(137Cs, 3H, 90Sr, 239+240Pu)농도와 240Pu/239Pu 동위원소비를 조사하였다. 우리나라 주변 해역에서 정해진 정점에서 연 2회 해수와 해양생물, 연 1회 해저퇴적물 시료를 확보하였다. 해수, 어류, 해조류, 패류, 해저퇴적물의 방사능농도 평가를 위한 기초자료를 확보하기위해서 해수의 연직구조, 해저퇴적물 및 해양생물의 특성조사
우리나라 주변 해역에서 해수, 해양생물, 해저퇴적물의 시료 중 방사능(137Cs, 3H, 90Sr, 239+240Pu)농도와 240Pu/239Pu 동위원소비를 조사하였다. 우리나라 주변 해역에서 정해진 정점에서 연 2회 해수와 해양생물, 연 1회 해저퇴적물 시료를 확보하였다. 해수, 어류, 해조류, 패류, 해저퇴적물의 방사능농도 평가를 위한 기초자료를 확보하기위해서 해수의 연직구조, 해저퇴적물 및 해양생물의 특성조사를 수행하였다. 해수, 어류, 해조류, 패류, 해저퇴적물 중 방사능농도, 핵종간 동위원소비는 과거 조사된 결과의 범위 이내이다.
또한, 일본 후쿠시마 원전 사고 이후 해수 및 어류의 방사능농도 조사를 강화하였다.
Abstract
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The purposes of the Marine Environmental Radioactivity Survey project, based on the Korean Atomic Safety Law 105, is to assess the distribution and the fluctuation of environmental radioactivity levels in the marine environment surrounding the Korean peninsula. The importance of the marine environme
The purposes of the Marine Environmental Radioactivity Survey project, based on the Korean Atomic Safety Law 105, is to assess the distribution and the fluctuation of environmental radioactivity levels in the marine environment surrounding the Korean peninsula. The importance of the marine environment radioactivity survey data are on the protection of public health as well as preservation of environment from radiological events to be occurred in the ocean around Korea and other country.
To accomplish the above purpose, the concentrations of 137Cs, 3H, 90Sr, and 239+240Pu, and 240Pu/239Pu isotopic ratio were analyzed and assessed in the seawater samples, marine organism samples, and sediment samples, which were collected by help of the National Fisheries Research and Development Institute.
In order to monitor environmental radioactivities for the surface seawater, the seawater samples have been collected biannually at the fixed 21∼22 stations off coast of Korea since 1994. The concentration of radionuclides and isotopic ratio between radionuclides in surface seawater were assessed using surveyed data cumulated from 1994. The seawater in the specific layer and sediments were collected, respectively, at 6 stations and 16 stations once a year in order to obtain the concentrations and isotopic ratio of artificial radionuclides. The environmental radioactivities in marine organisms (fish, shellfish, seaweed) were determined biannually.
In addition, the various environmental factors were surveyed and analyzed such as water temperature, salinity, nutrients, suspended solid, fisheries resources, and sediment types in order to understand relationship between the radionuclides and their oceanographic characteristics in marine organisms, sediments, and seawaters. Meanwhile, after Fukushima Dai-ichi Nuclear Power Plant accident in Japan, the marine environmental radioactivity survey was enhanced with increased sampling frequency for seawater sample and extended sampling area for seawater sample and fish sample.
As analytical results of 137Cs, 3H, 90Sr, and 239+240Pu in seawater collected biannually at 22 stations around Korean Peninsular, the concentrations of all radionuclides in 2014 are within the ranges obtained over the past 5 years (2009~2013): 137Cs (1.13 to 2.63 mBq/kg); 3H (<0.115 to 0.285 Bq/L); 90Sr (0.459 to 0.997 mBq/kg); 239+240Pu (1.48 to 14.6 μBq/kg). The isotopic ratios (240Pu/239Pu) ranged from 0.201 to 0.245 (an average of 0.238) which is in good agreement within the past 5 year range (2009~2013).
According to the survey results, the concentrations of radionuclides on the depth profiles of the seawater in the West Sea are vertically homogeneous each year. On the other hand, in the East Sea, the concentrations of 137Cs are observed to be homogeneous from the surface to 200 m depth, followed by a decreasing trend with depth below 200 m to 500 m. Meanwhile, the concentrations of 239+240Pu in the East Sea shows a increasing trend with depth below surface to 750 m, but almost no change with depth below 750 m.
The average concentrations of 137Cs, 40K, 90Sr and 239+240Pu in the sediments are 2.05 Bq/kg·dry, 760 Bq/kg·dry, 0.0882 Bq/kgㆍdry and 0.493 Bq/kg·dry, respectively. The average isotopic ratio of 240Pu/239Pu is 0.220.
Samples of biota including different species of fish, shellfish and seaweed are analysed for 137Cs, 40K, 90Sr and 239+240Pu. The concentrations of 137Cs, 40K, 90Sr and 239+240Pu in the 21 fish samples are found to be in the range of 42.8~285 mBq/kg·fresh, 37.6~111 Bq/kg·fresh, <4.68~7.33 mBq/kg·fresh, and <0.00910~0.0138 mBq/kg·fresh, respectively. The concentrations of 137Cs in all shellfish are below the minimum detectable activity (MDA, <37.1 mBq/kg·fresh). 40K, 90Sr and 239+240Pu show activity concentration in the range 16.8~67.1 Bq/kgㆍfresh, <6.44 mBq/kg·fresh and 0.156~2.26 mBq/kg·fresh, respectively. 137Cs concentrations in all seaweed are detected below MDA(<37.1 mBq/kg·fresh). 40K, 90Sr, 239+240Pu and 131I in algae are 10.9~423 Bq/kg·fresh, <0.860 mBq/kg·fresh, 1.35~2.55 mBq/kg·fresh and <24.3~770 mBq/kg·fresh. The average isotopic ratio of 240Pu/239Pu in fish, shellfish, seaweed are 0.248, 0.224, 0.212, respectively.
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