Earticle

초록

영어

Four different paddy soils collected around the Gyeongju nuclear site were treated with 99TcO4− solution under the assumption of two contrasting contamination scenarios. Scenario I (SN-I) is for a pre-transplanting deposition of 99Tc followed by plowing, whereas SN-II is for its deposition onto the water surface shortly after transplanting. Rice plants were grown in lysimeters in a greenhouse. Plant uptake of 99Tc was quantified with the TFarea (m2·kg−1-dry). The SN-II TFarea values for straws and brown rice, having been generally higher than the SN-I values, were within the ranges of 6.9x10−3~4.1x10−2 and 5.2x10−6~7.3x10−5, respectively. Sorption onto clay seems to have decreased 99Tc uptake in SN-I, whereas it may have had an insignificant effect in SN-II. A phenomenon characteristic of submerged paddy soil, i.e., the development of a thin oxic surface layer may have greatly affected the rice uptake of SN-II 99Tc. The surface-water concentrations of 99Tc were much higher in SN-II than in SN-I. For the percolating water, however, the opposite was generally true. At most 1.3% of the applied 99Tc were leached through such percolation. The use of empirical deposition time-dependent TFarea values was considered desirable in assessing the radiological impact of a growing-season deposition of 99Tc onto paddy fields.

목차

ABSTRACT
 1. INTRODUCTION
 2. MATERIAL AND METHODS
  2.1 Rice Culture in Lysimeters
  2.2 Application of 99Tc
  2.3 Sampling and Sample Treatments
  2.4 Analysis of 99Tc Activity
  2.5 Calculation and Reporting
 3. RESULTS AND DISCUSSIONS
  3.1 TFarea Values of 99Tc in SN-I and SN-II
  3.2 99Tc Concentrations in the Surface and Percolating Waters
  3.3 Implications in Food-Chain Dose Assessment
 4. CONCLUSIONS
 ACKNOWLEDGEMENTS
 REFERENCES

키워드

저자

• Yong-Ho Choi [ Korea Atomic Energy Research Institute ] Corresponding author
• Kwang-Muk Lim [ Korea Atomic Energy Research Institute ]
• In Jun [ Korea Atomic Energy Research Institute ]
• Byung-Ho Kim [ Korea Atomic Energy Research Institute ]
• Dong-Kwon Keum [ Korea Atomic Energy Research Institute ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  방사선방어학회지 [Journal of Radiation Protection and Research]

• 간기

  계간

• pISSN

  2508-1888

• 수록기간

  1976~2026

• 등재여부

  KCI 등재,SCOPUS

• 십진분류

  KDC 559 DDC 629