Abstract
In high power proton accelerator facilities, concrete shield can be highly activated, which makes maintenance work of accelerators quite difficult. So, a low-activationized concrete is planned to be partially adopted as a concrete shield at the accelerator facilities of Japan Proton Accelerator Research Complex (J-PARC) aiming at reducing γ-ray exposure dose during maintenance period. The low-activationized concrete is the one using limestone as an aggregate. A new quantity, {sup 24}Na-equivalent, was introduced as a criterion to assure effectiveness of the low-activationized concrete. In order to verify its effectiveness, test samples of both the low-activationized concrete and the ordinary concrete were irradiated using FNS at JAERI. The measurements were analyzed by using a shielding design calculation code system being used for J-PARC, showing that the measurements and the calculations of induced activity are in good agreement within a factor of two. Furthermore, by using the same code system, γ-ray exposure dose was calculated for modeled configuration of J-PARC to find out that γ-ray exposure dose due to the low-activationized concrete was about 10 times lower than that due to the ordinary concrete in a period of less than a few days after operation. (author)
Matsuda, Norihiro;
Nakashima, Hiroshi;
Kasugai, Yoshimi;
Sasamoto, Nobuo;
Kitami, Toshiyuki;
Ichimura, Takahito;
Ochiai, Kentaro;
Nishitani, Takeo;
[1]
Kinno, Masaru;
[2]
Hori, Junichi
[3]
- Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment
- Fujita Corp., Tokyo (Japan)
- Kyoto Univ., Research Reactor Institute, Kumatori, Osaka (Japan)
Citation Formats
Matsuda, Norihiro, Nakashima, Hiroshi, Kasugai, Yoshimi, Sasamoto, Nobuo, Kitami, Toshiyuki, Ichimura, Takahito, Ochiai, Kentaro, Nishitani, Takeo, Kinno, Masaru, and Hori, Junichi.
A study on induced activity in the low-activationized concrete for J-PARC.
Japan: N. p.,
2004.
Web.
Matsuda, Norihiro, Nakashima, Hiroshi, Kasugai, Yoshimi, Sasamoto, Nobuo, Kitami, Toshiyuki, Ichimura, Takahito, Ochiai, Kentaro, Nishitani, Takeo, Kinno, Masaru, & Hori, Junichi.
A study on induced activity in the low-activationized concrete for J-PARC.
Japan.
Matsuda, Norihiro, Nakashima, Hiroshi, Kasugai, Yoshimi, Sasamoto, Nobuo, Kitami, Toshiyuki, Ichimura, Takahito, Ochiai, Kentaro, Nishitani, Takeo, Kinno, Masaru, and Hori, Junichi.
2004.
"A study on induced activity in the low-activationized concrete for J-PARC."
Japan.
@misc{etde_20620314,
title = {A study on induced activity in the low-activationized concrete for J-PARC}
author = {Matsuda, Norihiro, Nakashima, Hiroshi, Kasugai, Yoshimi, Sasamoto, Nobuo, Kitami, Toshiyuki, Ichimura, Takahito, Ochiai, Kentaro, Nishitani, Takeo, Kinno, Masaru, and Hori, Junichi}
abstractNote = {In high power proton accelerator facilities, concrete shield can be highly activated, which makes maintenance work of accelerators quite difficult. So, a low-activationized concrete is planned to be partially adopted as a concrete shield at the accelerator facilities of Japan Proton Accelerator Research Complex (J-PARC) aiming at reducing γ-ray exposure dose during maintenance period. The low-activationized concrete is the one using limestone as an aggregate. A new quantity, {sup 24}Na-equivalent, was introduced as a criterion to assure effectiveness of the low-activationized concrete. In order to verify its effectiveness, test samples of both the low-activationized concrete and the ordinary concrete were irradiated using FNS at JAERI. The measurements were analyzed by using a shielding design calculation code system being used for J-PARC, showing that the measurements and the calculations of induced activity are in good agreement within a factor of two. Furthermore, by using the same code system, γ-ray exposure dose was calculated for modeled configuration of J-PARC to find out that γ-ray exposure dose due to the low-activationized concrete was about 10 times lower than that due to the ordinary concrete in a period of less than a few days after operation. (author)}
place = {Japan}
year = {2004}
month = {Mar}
}
title = {A study on induced activity in the low-activationized concrete for J-PARC}
author = {Matsuda, Norihiro, Nakashima, Hiroshi, Kasugai, Yoshimi, Sasamoto, Nobuo, Kitami, Toshiyuki, Ichimura, Takahito, Ochiai, Kentaro, Nishitani, Takeo, Kinno, Masaru, and Hori, Junichi}
abstractNote = {In high power proton accelerator facilities, concrete shield can be highly activated, which makes maintenance work of accelerators quite difficult. So, a low-activationized concrete is planned to be partially adopted as a concrete shield at the accelerator facilities of Japan Proton Accelerator Research Complex (J-PARC) aiming at reducing γ-ray exposure dose during maintenance period. The low-activationized concrete is the one using limestone as an aggregate. A new quantity, {sup 24}Na-equivalent, was introduced as a criterion to assure effectiveness of the low-activationized concrete. In order to verify its effectiveness, test samples of both the low-activationized concrete and the ordinary concrete were irradiated using FNS at JAERI. The measurements were analyzed by using a shielding design calculation code system being used for J-PARC, showing that the measurements and the calculations of induced activity are in good agreement within a factor of two. Furthermore, by using the same code system, γ-ray exposure dose was calculated for modeled configuration of J-PARC to find out that γ-ray exposure dose due to the low-activationized concrete was about 10 times lower than that due to the ordinary concrete in a period of less than a few days after operation. (author)}
place = {Japan}
year = {2004}
month = {Mar}
}