EPJ Web Conf.
Volume 231, 20208th International Meeting of Union for Compact Accelerator-Driven Neutron Sources (UCANS-8)
|Number of page(s)||7|
|Published online||11 March 2020|
Study of a collimation method as a nondestructive diagnostic diagnostic technique by PGNAA for salt distribution in concrete structures at RANS
1 RIKEN Center for Advanced Photonics, Neutron Beam Technology Team, Wako, Saitama, Japan
2 Tokyo Institute of Technology, Meguro, Tokyo, Japan
3 J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki, Japan
* Corresponding author: email@example.com
Published online: 11 March 2020
To meet strong demand for realizing an effective tool to diagnose salt distribution in concrete infrastructures, we have started a development of a new technique using a prompt gamma neutron activation analysis (PGNAA) at the RIKEN accelerator-driven compact neutron source (RANS). So far, by applying PGNAA we have experimentally confirmed that neutrons from RANS can detect small enough amounts of chlorine within the marginal concentration of around 1.2 kg/m3 to involve steel corrosion. In this study, we have proposed two methods to derive the salt depth profile which is critical information of steel corrosion start. The first one utilizes a difference in the intensity ratio of two different γ-ray energies of interest, which is depending on the depth where the neutron capture reaction arises inside the concrete. The second is called the collimator method that measure γ-rays coming through a collimator around detector. Detection of γ-ray associated with 35Cl coming from the assembly of concrete has been also simulated with conditions of neutrons from RANS and a collimator. The feasibility of the method was discussed.
© The Authors, published by EDP Sciences, 2020
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