Development of in-core monitoring system using radiation resistant optical fibers

Tsunemi Kakuta, Masaharu Nakazawa, Tatsuo Shikama, Minoru Narui

Research output: Contribution to conferencePaper

2 Citations (Scopus)

Abstract

With the aim to develop new in-core monitoring system using optical techniques, studies have been started on heavy neutron irradiation effects on optical fibers. Two types of highly radiation resistant optical fibers, pure silica(SiO2) with OH content core and SiO2 with fluorine doped core fibers were irradiated in the core region of JMTR. The fibers were irradiated under fast neutron flux(E>1.0MeV) of about 1×1017 n/m2s and gamma-ray dose rate of 2×103 Gy/s. The optical absorption and the light emission spectrum change were measured in-situ along the irradiation. As a result, the following effects have become clear. Large absorption loss at wavelength of shorter than 700 nm and loss peak of 630 nm were appeared. However, the increase in absorption was quite low in the wavelength from 700 to 1700 nm. The SiO2 fibers were survived up to 3×1023 n/m2. During irradiation, the induced light emission in the wavelength from 400 to 1700 nm and light peak at about 1200 nm were observed. Induced light emission was directly proportional to the neutron yield.

Original languageEnglish
Pages371-374
Number of pages4
Publication statusPublished - 1995 Jan 1
EventProceedings of the 1994 Nuclear Science Symposium and Medical Imaging Conference. Part 1 (of 4) - Norfolk, VA, USA
Duration: 1994 Oct 301994 Nov 5

Other

OtherProceedings of the 1994 Nuclear Science Symposium and Medical Imaging Conference. Part 1 (of 4)
CityNorfolk, VA, USA
Period94/10/3094/11/5

ASJC Scopus subject areas

  • Computer Vision and Pattern Recognition
  • Industrial and Manufacturing Engineering

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  • Cite this

    Kakuta, T., Nakazawa, M., Shikama, T., & Narui, M. (1995). Development of in-core monitoring system using radiation resistant optical fibers. 371-374. Paper presented at Proceedings of the 1994 Nuclear Science Symposium and Medical Imaging Conference. Part 1 (of 4), Norfolk, VA, USA, .