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Journal Articles

Microdosimetry study of proton quality factor using analytic model calculations

Papadopoulos, A.*; Kyriakou, I.*; Matsuya, Yusuke; Incerti, S.*; Daglis, I. A.*; Emfietzoglou, D.*

Applied Sciences (Internet), 12(18), p.8950_1 - 8950_20, 2022/09

 Times Cited Count:1 Percentile:0(Chemistry, Multidisciplinary)

The quality factor (Q) is the index which is used when evaluating the stochastic (e.g., carcinogenic) risk of diverse ionizing radiations. While the Q value can be commonly determined from the Linear Energy Transfer (LET), more elaborate approaches are based on the microdosimetric parameter lineal energy (y) calculated either by analytical model or Monte Carlo (MC) simulations. However, the developing of the model for determining the Q value is still ongoing worldwide for realizing the precise risk assessment. In this study, various generalized analytical models that account for both $$delta$$-ray transport and energy-loss straggling effects are utilized to evaluate the Q values over the proton energy range 1-250 MeV. The results revealed that the LET-based ICRP Report 60 recommendations underestimate the microdosimetric-based Q values of protons with energy below 100 MeV, which was also confirmed by using MC simulation data on the y values. The present work shows that analytic models may offer a practical alternative to computer-intensive MC simulations for calculating Q values based on the microdosimetric methodologies. In future study, we are planning to compare the y spectra and subsequent calculations of Q based on new MC data with the latest versions of Geant4-DNA and PHITS track structure codes which make use of different physics models.

Journal Articles

New design of a sample cell for neutron reflectometry in liquid-liquid systems and its application for studying structures at air-liquid and liquid-liquid interfaces

Akutsu-Suyama, Kazuhiro*; Yamada, Norifumi*; Ueda, Yuki; Motokawa, Ryuhei; Narita, Hirokazu*

Applied Sciences (Internet), 12(3), p.1215_1 - 1215_10, 2022/02

 Times Cited Count:0 Percentile:0(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

Bias effects on g- and s-factors in Westcott convention

Harada, Hideo

Applied Sciences (Internet), 11(14), p.6558_1 - 6558_20, 2021/07

 Times Cited Count:0 Percentile:0(Chemistry, Multidisciplinary)

For accuracy improvement of neutron activation analysis and neutron capture cross section, bias effects are investigated on g- and s-factors in the Westcott convention. As origins of biases, a joining function shape, neutron temperature and sample temperature, have been investigated. Biases are quantitatively deduced for two 1/v isotopes ($$^{197}$$Au, $$^{59}$$Co) and six non-1/v isotopes ($$^{241}$$Am, $$^{151}$$Eu, $$^{103}$$Rh, $$^{115}$$In, $$^{177}$$Hf, $$^{226}$$Ra). The s-factor calculated with a joining function deduced recently by a detailed Monte Carlo simulation is compared to s-factors calculated with traditional joining functions by Westcott. The results show the bias induced by sample temperature is small as the order of 0.1% for g-factor and the order of 1% for s-factor. On the other hand, biases induced by a joining function shape for s-factor depend significantly on both isotopes and neutron temperature. As the result, reaction rates are also affected significantly as well. The bias size on reaction rate is given in the case of epithermal neutron index r = 0.1, for the eight isotopes.

Journal Articles

Analysis and mapping of detailed inner information of crystalline grain by wavelength-resolved neutron transmission imaging with individual Bragg-dip profile-fitting analysis

Sakurai, Yosuke*; Sato, Hirotaka*; Adachi, Nozomu*; Morooka, Satoshi; Todaka, Yoshikazu*; Kamiyama, Takashi*

Applied Sciences (Internet), 11(11), p.5219_1 - 5219_17, 2021/06

 Times Cited Count:2 Percentile:43.28(Chemistry, Multidisciplinary)

Journal Articles

Proposal of laser-induced ultrasonic guided wave for corrosion detection of reinforced concrete structures in Fukushima Daiichi Nuclear Power Plant decommissioning site

Furusawa, Akinori; Takenaka, Yusuke; Nishimura, Akihiko

Applied Sciences (Internet), 9(17), p.3544_1 - 3544_12, 2019/09

 Times Cited Count:7 Percentile:58.98(Chemistry, Multidisciplinary)

Remote-controlled, non-destructive testing is necessary to detect corrosion of the reinforced concrete structures at the Fukushima Daiichi Nuclear Power Plant (NPP) de-commissioning site. This work aims to demonstrate that laser-induced ultrasonic guided wave technology can be applied to achieve this task. Hence, accelerated electrolytic corrosion is performed on a reinforced concrete specimen fabricated by embedding a steel rod into mortar. Waveforms of the laser-induced ultrasonic guided wave on the rod are measured with a previously employed piezoelectric transducer (PZT) probe, for each fixed corrosion time. Based on the results of Fourier and wavelet transforms of the waveforms, issues concerning the detection and extent of rebar corrosion are discussed. It is exhibited that the changes in bonding strength due to corrosion are distinguishable in the frequency domain of the ultrasonic signal.

Journal Articles

Towards laser driven hadron cancer radiotherapy; A Review of progress

Ledingham, K.*; Bolton, P. R.*; Shikazono, Naoya; Ma, C.-M.*

Applied Sciences (Internet), 4(3), p.402 - 443, 2014/09

 Times Cited Count:76 Percentile:89.45(Chemistry, Multidisciplinary)

Journal Articles

Evaluation of a wet chemistry method for isolation of cyclotron produced [$$^{211}$$At] astatine

Balkin, E. R.*; Hamlin, D. K.*; Gagnon, K.*; Chyan, M.-K.*; Pal, S.*; Watanabe, Shigeki; Wilbur, D. S.*

Applied Sciences (Internet), 3(3), p.636 - 655, 2013/09

 Times Cited Count:30 Percentile:84.33(Chemistry, Multidisciplinary)

Journal Articles

Ultra-intense, high spatio-temporal quality petawatt-class laser system and applications

Kiriyama, Hiromitsu; Shimomura, Takuya; Mori, Michiaki; Nakai, Yoshiki*; Tanoue, Manabu; Kondo, Shuji; Kanazawa, Shuhei; Pirozhkov, A. S.; Esirkepov, T. Z.; Hayashi, Yukio; et al.

Applied Sciences (Internet), 3(1), p.214 - 250, 2013/03

 Times Cited Count:15 Percentile:52.23(Chemistry, Multidisciplinary)

This paper reviews techniques for improving the temporal contrast and spatial beam quality in an ultra-intense laser system that is based on chirped-pulse amplification (CPA). We describe the design, performance, and characterization of our laser system, which has the potential for achieving a peak power of 600 TW. We also describe applications of the laser system in the relativistically dominant regime of laser-matter interactions and discuss a compact, high efficiency diode-pumped laser system.

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