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Sato, Yuki
Applied Radiation and Isotopes, 212, p.111421_1 - 111421_8, 2024/10
Times Cited Count:0 Percentile:0.00(Chemistry, Inorganic & Nuclear)Sakoda, Akihiro; Ishimori, Yuu; Jin, Q.*; Iimoto, Takeshi*
Applied Radiation and Isotopes, 207, p.111180_1 - 111180_8, 2024/05
Times Cited Count:1 Percentile:75.38(Chemistry, Inorganic & Nuclear)The impacts of mathematical models and associated parameters on radon (Rn) and thoron (
Rn) exhalation rates based on in-situ testing at building interior solid walls were demonstrated to improve data analysis techniques. The results showed that the heterogeneity of their activity concentrations within the measurement system was more significant for thoron than radon. The diurnal variation in indoor radon should be considered for better data quality. In conclusion, a model should be appropriately made and selected under the purposes and accuracy requirements of the exhalation test.
Sato, Yuki
Applied Radiation and Isotopes, 203, p.111083_1 - 111083_9, 2024/01
Times Cited Count:1 Percentile:34.39(Chemistry, Inorganic & Nuclear)Takahatake, Yoko; Watanabe, So; Arai, Tsuyoshi*; Sato, Takahiro*; Shibata, Atsuhiro
Applied Radiation and Isotopes, 196, p.110783_1 - 110783_5, 2023/06
Times Cited Count:1 Percentile:34.39(Chemistry, Inorganic & Nuclear)Sato, Yuki
Applied Radiation and Isotopes, 195, p.110739_1 - 110739_9, 2023/05
Times Cited Count:3 Percentile:73.09(Chemistry, Inorganic & Nuclear)Yamamoto, Masahiko; Horigome, Kazushi; Kuno, Takehiko
Applied Radiation and Isotopes, 190, p.110460_1 - 110460_7, 2022/12
Times Cited Count:2 Percentile:34.71(Chemistry, Inorganic & Nuclear)Gravimetric measurement of U content in UO with ignition in the air has been investigated. The ignition temperature, ignition time and aliquot sample mass are optimized as 900
C, 60 minutes, and 1 g, respectively. The method is validated by IDMS with uncertainty estimation. The obtained result by gravimetry is 0.78236
0.00051 g/g (k=2) and agreed with IDMS value within its uncertainty. It has been found that U in UO
can be measured accurately and precisely by gravimetry.
Komeda, Masao; Toh, Yosuke
Applied Radiation and Isotopes, 188, p.110391_1 - 110391_6, 2022/10
Times Cited Count:0 Percentile:0.00(Chemistry, Inorganic & Nuclear)Sato, Yuki
Applied Radiation and Isotopes, 185, p.110254_1 - 110254_7, 2022/07
Times Cited Count:1 Percentile:17.57(Chemistry, Inorganic & Nuclear)Tohamy, M.*; Abbas, K.*; Nonneman, S.*; Rodriguez, D.; Rossi, F.
Applied Radiation and Isotopes, 173, p.109694_1 - 109694_7, 2021/07
Times Cited Count:5 Percentile:53.33(Chemistry, Inorganic & Nuclear)Nagaoka, Mika; Fujita, Hiroki; Aida, Taku*; Guo, H.*; Smith, R. L. Jr.*
Applied Radiation and Isotopes, 168, p.109465_1 - 109465_6, 2021/02
Times Cited Count:0 Percentile:0.00(Chemistry, Inorganic & Nuclear)The radioactivities in the environmental samples are analyzed to monitor the nuclear power facilities. The pretreatment of radioactive nuclides of alpha and beta emitters in the environmental samples is performed with acid to decompose organic matter and extract object nuclide such as Sr, U and Pu. However, the pretreatment methods are time-consuming and used many concentrated acid solutions that are unsafe and hazardous. Therefore, we develop to the new pretreatment method using supercritical water instead of acid. Hydrothermal pretreatment of soils (Andosols) from Ibaraki prefecture (Japan) was used to improve methods for monitoring radioactive Sr and U. Calcined samples were pretreated with subcritical or supercritical water (SCW) followed by extraction with 0.5 M HNO
solutions. With SCW pretreatment, recoveries of Sr and U were 70% and 40%, respectively. Experimental recoveries obtained can be described by a linear relationship in water density. The proposed method is robust and can lower environmental burden of routine analytical protocols.
Ikebe, Yurie*; Oshima, Masumi*; Bamba, Shigeru*; Asai, Masato; Tsukada, Kazuaki; Sato, Tetsuya; Toyoshima, Atsushi*; Bi, C.*; Seto, Hirofumi*; Amano, Hikaru*; et al.
Applied Radiation and Isotopes, 164, p.109106_1 - 109106_7, 2020/10
Times Cited Count:2 Percentile:19.27(Chemistry, Inorganic & Nuclear)Boron Neutron Capture Therapy (BNCT) is a radiotherapy for the treatment of intractable cancer. In BNCT precise determination of B concentration in whole blood sample before neutron irradiation is crucial for control of the neutron irradiation time and the neutron dosimetry. We have applied the Charged Particle Activation Analysis (CPAA) to non-destructive and accurate determination of
B concentration in whole blood sample. The experiment was performed at JAEA Tandem Accelerator using an 8 MeV proton beam. The 478 keV
ray of
Be produced in the
B(p,
)
Be reaction was used to quantify the
B, and
rays of
Co originating from the reaction with Fe in blood was used to normalize the
-ray intensity. The results demonstrated that the present CPAA method can be applied to the determination of the
B concentration in the blood sample.
Rodriguez, D.; Rossi, F.; Takahashi, Tone; Seya, Michio*; Koizumi, Mitsuo
Applied Radiation and Isotopes, 159, P. 109083_1, 2020/05
Times Cited Count:0 Percentile:0.00(Chemistry, Inorganic & Nuclear)Yamamoto, Masahiko; Taguchi, Shigeo; Do, V. K.; Kuno, Takehiko; Surugaya, Naoki
Applied Radiation and Isotopes, 152, p.37 - 44, 2019/10
Times Cited Count:9 Percentile:65.28(Chemistry, Inorganic & Nuclear)An online measurement system using an alpha liquid scintillation counter (-LSC) coupled to microchip solvent extraction has been developed. A flow-through cell of
-LSC has been prepared by packing PTFE tube into glass tube to combine microchip. Two-phase flow in microchannel has been stabilized by using coiled tube. The Pu in organic phase has been mixed with scintillation cocktail by T-junction connectors. The system separates and detects Pu by online with detection limit of 6.5 Bq/mL, generating only
L-level wastes.
Yin, Y.-G.*; Ishii, Satomi*; Suzui, Nobuo*; Igura, Masato*; Kurita, Keisuke; Miyoshi, Yuta*; Nagasawa, Naotsugu*; Taguchi, Mitsumasa*; Kawachi, Naoki*
Applied Radiation and Isotopes, 151, p.7 - 12, 2019/09
Times Cited Count:6 Percentile:49.93(Chemistry, Inorganic & Nuclear)Accurate analysis of N fixation in leguminous crops requires determination of N utilization within an intact plant however, most approaches require tissue disassembly. We developed a simple and rapid technique to generate high-purity and high-yield [
N]N
gas and obtained real-time images of N fixation in an intact soybean plant. The purification efficiency was
81.6% after decay correction.
Tomita, Jumpei; Takeuchi, Erina
Applied Radiation and Isotopes, 150, p.103 - 109, 2019/08
Times Cited Count:18 Percentile:86.45(Chemistry, Inorganic & Nuclear)A rapid analytical method for determining Sr in urine samples (1-2 L) was developed to assess the internal exposure of workers in a radiological emergency. Strontium in a urine sample was rapidly separated by phosphate co-precipitation, followed by extraction chromatography with a tandem column of Pre-filter, TRU and Sr resin, and the
Sr activity was determined by ICP-MS/MS. Measurement in the MS/MS mode with an O
reaction gas flow rate 1 mL min
showed no tailing of
Sr at m/z = 90 up to 50 mg-Sr L
. The interferences of Ge, Se and Zr at m/z = 90 were successfully removed by chemical separation. This analytical method was validated by the results of the analyses of synthetic urine samples (1.2-1.6 L) containing a known amount of
Sr along with 1 mg of each of Ge, Se, Sr and Zr. The turnaround time for analysis was about 10 h, and the detection limit of
Sr was approximately 1 Bq per urine sample.
Rodriguez, D.; Rossi, F.; Takahashi, Tone; Seya, Michio; Koizumi, Mitsuo
Applied Radiation and Isotopes, 148, p.114 - 125, 2019/06
Times Cited Count:6 Percentile:49.93(Chemistry, Inorganic & Nuclear)Yokoyama, Kaoru; Ohashi, Yusuke
Applied Radiation and Isotopes, 145, p.19 - 23, 2019/03
Times Cited Count:5 Percentile:43.37(Chemistry, Inorganic & Nuclear)Dismantled materials generated from nuclear facilities are reused or directed to repository sites. If scrap metals with complicated shapes can be cleared, the amounts of radioactive waste can be reduced. A clearance verification system is constructed to determine the amount of uranium in decontaminated metals in a drum using the 1.001 MeV gamma rays of Pa, produced in the decay of
U. The experimental study with simulated waste drums demonstrated that the quantification errors of uranium fall within 25% for 0.5g of uranium.
Hirouchi, Jun; Nishizawa, Yukiyasu*; Urabe, Yoshimi*; Shimada, Kazumasa; Sanada, Yukihisa; Munakata, Masahiro
Applied Radiation and Isotopes, 141, p.122 - 129, 2018/11
Times Cited Count:1 Percentile:10.33(Chemistry, Inorganic & Nuclear)Ho, H. Q.; Honda, Yuki*; Hamamoto, Shimpei; Ishii, Toshiaki; Fujimoto, Nozomu*; Ishitsuka, Etsuo
Applied Radiation and Isotopes, 140, p.209 - 214, 2018/10
Times Cited Count:4 Percentile:34.56(Chemistry, Inorganic & Nuclear)Ho, H. Q.; Honda, Yuki; Motoyama, Mizuki*; Hamamoto, Shimpei; Ishii, Toshiaki; Ishitsuka, Etsuo
Applied Radiation and Isotopes, 135, p.12 - 18, 2018/05
Times Cited Count:8 Percentile:58.42(Chemistry, Inorganic & Nuclear)