Earticle

초록

영어

High density polyethylene (HDPE) is degraded due to a radiation-induced oxidation when it is used as a neutron moderator in a neutron counter for a nuclear material accounting of spent fuels. The HDPE exposed to the gamma-ray emitted from the fission products in a spent nuclear fuel results in a radiation-induced degradation which changes its original molecular structure to others. So a neutron moderating power variation of HDPE, irradiated by a gamma radiation,
was investigated in this work. Five HDPE moderator structures were exposed to the gamma radiation emitted from a 60Co source to a level of 105-109 rad to compare their post-irradiation properties. As a result of the neutron measurement test with 5 irradiated HDPE structures and a neutron measuring system, it was confirmed that the neutron moderating power for the 105 rad irradiated HDPE moderator revealed the largest decrease when the un-irradiated pure one was used as a reference. It implies that a neutron moderating power variation of HDPE is not directly proportional to the integrated gamma dose rate. To clarify the cause of these changes, some techniques such as a FTIR, an element analysis and a densitometry were employed. As a result of these analyses, it was confirmed that the molecular structure of the gamma irradiated HDPEs had partially changed to others, and the contents of hydrogen and oxygen had varied during the process of a radiation-induced degradation. The mechanism of these changes cannot be explained in detail at present, and thus need further study.

목차

1. INTRODUCTION
 2. THEORETICAL BACKGROUND
 3. EXPERIMENTAL
  3.1 HDPE Moderator Structure Preparation
  3.1 HDPE Moderator Structure Preparation
  3.2 Gamma Irradiation
  3.3 Neutron Measurement
  3.4 Element Content
  3.5 FTIR Spectroscopy
 4. RESULTS AND DISCUSSION
  4.1 Neutron Moderating Power by an Experimental Measurement
  4.2 Composition of the Elements in HDPE
  4.3 Neutron Moderating Power by a Theoretical Calculation
  4.4 FTIR Spectroscopy
 5. CONCLUSIONS
 REFERENCES

키워드

저자

• KWANG-JUNE PARK [ Korea Atomic Energy Research Institute ] Corresponding author
• JUNE-SIK JU [ Korea Atomic Energy Research Institute ]
• HEE-YOUNG KANG [ Korea Atomic Energy Research Institute ]
• HEE-SUNG SHIN [ Korea Atomic Energy Research Institute ]
• HO-DONG KIM [ 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