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A Study on the Non-Destructive Detection of Salt in Concrete Using Neutron-Captured Prompt-Gamma Rays at RANS

Yasuo WAKABAYASHI¹⁾, Yuichi YOSHIMURA^1,2), Maki MIZUTA¹⁾, Yoshimasa IKEDA¹⁾, Takao HASHIGUCHI¹⁾, Tomohiro KOBAYASI¹⁾, Atsushi TAKETANI¹⁾, Shinzo YANAGIMACHI¹⁾, Makoto GOTO¹⁾, Hideyuki SUNAGA¹⁾, Yujiro IKEDA^1,3) and Yoshie OTAKE¹⁾

1)

RIKEN, RIKEN Advanced Photonics, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan

2)

Tokyo Institute of Technology, Laboratory for Advanced Nuclear Energy, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan

3)

J-PARC Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan

(Received 31 July 2017 / Accepted 31 March 2018 / Published 22 May 2018)

Abstract

We are studying the non-destructive detection of salt gradients in concrete using a neutron-captured prompt-gamma-ray analysis at the RIKEN Accelerator-driven compact Neutron Source (RANS). The neutrons at RANS are generated via a 7-MeV proton and 300-μm-thick beryllium target and are moderated via a polyethylene moderator. Samples, e.g., mortar samples with varying salt contents and part of an existing salt-damaged bridge, were irradiated by neutrons; then, the gamma rays following the neutron capture reaction were detected by germanium detectors placed near the samples. From the results, we obtained the detection sensitivity of the chloride content in a medium.

Copyright (c) 2018 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

neutron capture, prompt gamma ray, compact neutron source, salt damage, non-destructive diagnosis

DOI: 10.1585/pfr.13.2404052

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References

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