초록 ▼

우리나라 주변 해역에서 해수, 해양생물, 해저퇴적물의 시료 중 방사능 (윗첨자 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

우리나라 주변 해역에서 해수, 해양생물, 해저퇴적물의 시료 중 방사능 (윗첨자 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 범위이내이다.

또한, 일본 후쿠시마 원전 사고 이후 해수 및 어류의 방사능농도 조사를 강화하였다.

(출처: 간행물정보양식 초록)

Abstract ▼

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 radioactivity survey results are i

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 radioactivity survey results are importance 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 from1994. 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 ceanographic 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 2015 are within the ranges obtained over the past 5 years (2010∼2014): ¹³⁷Cs (1.09 to 2.77mBq/kg); ³H (0.109 to 0.360 Bq/L); ⁹⁰Sr (0.402 to 1.15 mBq/kg); ^239+240Pu (2.68 to 8.46 μ Bq/kg). The isotopic ratios (²⁴⁰Pu/²³⁹Pu) ranged from 0.186 to 0.263 (an average of 0.224) which is in good agreement within the past 5 year range (2010∼2014).

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 1.92 Bq/kg·dry, 757 Bq/kg·dry, <0.100 Bq/kgㆍdry and 0.484 Bq/kg·dry, respectively. The average isotopic ratio of ²⁴⁰Pu/²³⁹Pu is 0.216.

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 39.9∼172mBq/kg·fresh, 42.6∼130 Bq/kg·fresh, <8.73 mBq/kg·fresh, and <0.633 mBq/kg·fresh, respectively. The concentrations of ¹³⁷Cs in all shellfish are below the minimumdetectable activity (MDA, <36.7 mBq/kg·fresh). ⁴⁰K, ⁹⁰Sr and ^239+240Pu show activity concentration in the range 15.4∼74.8 Bq/kgㆍfresh, <5.28 mBq/kg·fresh and 0.778∼ 2.63 mBq/kg·fresh, respectively. ¹³⁷Cs concentrations in all seaweed are detected below MDA(<48.0 mBq/kg·fresh). ⁴⁰K, ⁹⁰Sr, ^239+240Pu and ¹³¹I in algae are 10.9∼485Bq/kg·fresh, <11.9 mBq/kg·fresh, 2.00∼2.60 mBq/kg·fresh and <28.8 mBq/kg·fresh. The average isotopic rat io of ²⁴⁰Pu/²³⁹Pu in shellfish, seaweed are 0.220, 0.236, respectively.

(출처:SUMMARY)

목차 Contents

• 표지 ... 1
• 제 출 문 ... 3
• 사 업 참 여 자 ... 5
• 목차 ... 7
• 요 약 ... 9
• SUMMARY ... 11
• 그림목차 ... 13
• 표목차 ... 14
• I. 서론 ... 17
• II. 해양방사능 조사 ... 21
• 1. 조사목적 및 조사계획 ... 23
• 1.1 조사목적 ... 23
• 1.2 조사계획 ... 23
• 2. 조사 및 분석방법 ... 26
• 2.1 조사방법 ... 26
• 2.2 분석방법 ... 26
• 3. 조사결과 및 평가 ... 31
• 3.1 표층 해수 ... 31
• 3.2 수심별 해수 ... 43
• 3.3 해저퇴적물 ... 50
• 3.4 해양생물 ... 52
• Ⅲ. 해양환경조사 ... 61
• 1. 조사내용 ... 63
• 2. 조사방법 및 분석방법 ... 65
• 2.1 물리·화학적조사 ... 65
• 2.2 생물학적 조사 ... 65
• 2.3 해저퇴적물 조사 ... 67
• 3. 조사결과 ... 70
• 3.1 수온, 염분 ... 70
• 3.2 영양염과 부유물질 ... 76
• 3.3 해저퇴적물 ... 80
• 3.4 미량금속의 농도 ... 81
• Ⅳ. 해양방사능조사 강화 ... 83
• 1. 방사능감시 강화계획 ... 85
• 2. 조사결과 ... 87
• Ⅴ. 결 론 ... 107
• 끝페이지 ... 113