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Journal Articles

Shielding performance of newly developed boron-loaded concrete for DT neutrons

Sato, Satoshi*; Konno, Chikara; Nakashima, Hiroshi; Shionaga, Ryosuke*; Nose, Hiroyuki*; Ito, Yuji*; Hashimoto, Hirohide*

Journal of Nuclear Science and Technology, 55(4), p.410 - 417, 2018/04

 Times Cited Count:1 Percentile:11.6(Nuclear Science & Technology)

In order to enhance the neutron shielding performance, we developed concrete with boron of more than 10 wt%. We performed a neutron shielding experiment using the mockup of the newly developed boron-loaded concrete and DT neutrons at FNS in JAEA, and measured the reaction rates of the $$^{93}$$Nb(n,2n)$$^{92m}$$Nb and $$^{197}$$Au(n,$$gamma$$)$$^{198}$$Au reactions in the mockup. The calculations were conducted by using MCNP-5.14 and FENDL-2.1. The calculation results agreed well with the measured ones, and we confirmed that the accuracy was very good on the atomic composition data of the boron-loaded concrete and their nuclear data. In addition, we calculated effective dose rates and reaction rates of the $$^{59}$$Co(n,$$gamma$$)$$^{60}$$Co and $$^{151}$$Eu(n,$$gamma$$)$$^{152}$$Eu reactions in the boron-loaded concrete and other concretes. It is concluded that the boron-loaded concrete has much better shielding performance for DT neutrons than other concretes.

Journal Articles

PHITS; A Particle and heavy ion transport code system

Niita, Koji*; Sato, Tatsuhiko; Iwase, Hiroshi*; Nose, Hiroyuki*; Nakashima, Hiroshi; Sihver, L.*

Radiation Measurements, 41(9-10), p.1080 - 1090, 2006/10

 Times Cited Count:203 Percentile:99.78(Nuclear Science & Technology)

The paper presents a summary of the recent development of the multi-purpose Monte Carlo Particle and Heavy Ion Transport code System, PHITS. In particular, we discuss in detail the development of two new models, JAM and JQMD, for high energy particle interactions, incorporated in PHITS, and show comparisons between model calculations and experiments for the validations of these models. The paper presents three applications of the code including spallation neutron source, heavy ion therapy and space radiation. The results and examples shown indicate PHITS has great ability of carrying out the radiation transport analysis of almost all particles including heavy ions within a wide energy range.

Oral presentation

Shielding experiment for new concrete with high concentration of boron by using DT neutrons, 2; Shielding experiment by using DT neutrons

Sato, Satoshi; Shionaga, Ryosuke*; Nose, Hiroyuki*; Konno, Chikara; Nakashima, Hiroshi

no journal, , 

In order to study the neutron shielding performance of the new concrete with high concentration of boron, the shielding experiment has been performed by using the DT neutron source at FNS in JAEA. The experimental mockup of the concrete with high concentration of boron was 40 cm in height, 40 cm in width and 60 cm in thickness. The distance between the DT neutron source and the mockup was 20 cm. Niobium and gold foils were inserted every 5 cm in depth along the center of the mockup. Reaction rates were measured on the $$^{93}$$Nb(n,2n)$$^{92m}$$Nb and $$^{197}$$Au(n,gamma)$$^{198}$$Au reactions. A calculation with MCNP and FENDL-2.1 was done for the experiment. The calculation results agreed well with the measured ones in the both reaction rates. Another calculation was also conducted on the condition that the experimental mockup was replaced by the ordinary concrete. The reaction rate of the $$^{197}$$Au(n,gamma)$$^{198}$$Au reaction in the new concrete with high concentration of boron was about 1/40 of that in the ordinary concrete at the position of 50 cm in depth, and it was confirmed that the new concrete with high concentration of boron could reduce the neutron flux of low energy.

Oral presentation

Shielding experiment for new concrete with high concentration of boron by using DT neutrons, 1; Development of new concrete with high concentration of boron

Shionaga, Ryosuke*; Nose, Hiroyuki*; Ito, Yuji*; Kato, Hiroaki*; Hashimoto, Hirohide*; Sato, Satoshi

no journal, , 

In order to enhance the neutron shielding performance in nuclear power facilities, medical facilities and research facilities with large-scale accelerators, we have developed a new concrete with high concentration of boron of 10 weight %. Natural Colemanite minerals with a mass of boron were applied to the aggregates for the concrete. In addition, modification of the cement type and application of the special mixture material were performed to eliminate bad effects of the insufficient hardening and the strength degradation of the cement, and we successfully increased the boron concentration in the concrete up to 10 weight %. The flow rate in JIS flow test was about 150 mm before hardening of the material, which showed good flow property. We also confirmed that the compressive strength was about 40 N/mm$$^{2}$$ at the material age of 7 days. Based on the results, the block specimens were fabricated for the shielding experiment using DT neutrons.

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