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Journal Articles

Neutron emission spectrum from gold excited with 16.6 MeV linearly polarized monoenergetic photons

Kirihara, Yoichi; Nakashima, Hiroshi; Sanami, Toshiya*; Namito, Yoshihito*; Itoga, Toshiro*; Miyamoto, Shuji*; Takemoto, Akinori*; Yamaguchi, Masashi*; Asano, Yoshihiro*

Journal of Nuclear Science and Technology, 57(4), p.444 - 456, 2020/04

 Times Cited Count:2 Percentile:32.52(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Systematic measurement of lineal energy distributions for proton, He and Si ion beams over a wide energy range using a wall-less tissue equivalent proportional counter

Tsuda, Shuichi; Sato, Tatsuhiko; Takahashi, Fumiaki; Satoh, Daiki; Sasaki, Shinichi*; Namito, Yoshihito*; Iwase, Hiroshi*; Ban, Shuichi*; Takada, Masashi*

Journal of Radiation Research, 53(2), p.264 - 271, 2012/04

 Times Cited Count:12 Percentile:54.92(Biology)

Deposit energy distribution in microscopic site is basic information for understanding of biological effects of energetic heavy ion beams. To estimate RBE, lineal energy, $$y$$, can be an appropriate physical index. In this work, a wall-less tissue equivalent proportional counter has been designed and used for the measurement of $$y$$ distributions, $$y$$$$f$$($$y$$), for 160 MeV H, 150 MeV/u He, 290 MeV/u C, 490 MeV/u Si and 500 MeV/u Ar. Data of $$y$$$$f$$($$y$$) were also obtained in the wide range of LET. The dose-means of $$y$$, $$overline{y}$$$$_{D}$$, were compared with those calculated by the microdosimetric function of PHITS. It is found that the calculated $$y$$$$f$$($$y$$) and $$overline{y}$$$$_{D}$$ agree fairly well with those measured. The values of $$overline{y}$$$$_{D}$$ are larger than those of LET less than $$sim$$10 keV/$$mu$$m because of the discrete energy deposition by delta rays, while the relation is reversed above 10 keV/$$mu$$m. The results indicate that care should be taken in the difference between $$overline{y}$$$$_{D}$$ and LET when the values of RBE of energetic heavy ions are estimated.

Journal Articles

Measurement of lineal energy distribution of heavy ion using wall-less tissue equivalent proportional counter

Tsuda, Shuichi; Sato, Tatsuhiko; Takahashi, Fumiaki; Satoh, Daiki; Sasaki, Shinichi*; Namito, Yoshihito*; Iwase, Hiroshi*; Ban, Shuichi*; Takada, Masashi*

KEK Proceedings 2011-8, p.100 - 108, 2011/12

Deposit energy distribution in microscopic site is basic information for understanding of biological effects of energetic heavy ion beams. To estimate RBE, lineal energy, y, can be an appropriate physical index. In this work, a wall-less tissue equivalent proportional counter has been designed and used for the measurement of y distributions, $$yf(y)$$, for 160 MeV H, 150 MeV/u He and 490 MeV/u Si ion beams. Data of $$yf(y)$$ and the dose-means of $$y$$, $$overline{y}_D$$, were compared with those calculated by the microdosimetric function of PHITS. It is found that the calculated $$yf(y)$$ and $$overline{y}_D$$ agree fairly well with those measured, as well as the already reported result of 290 MeV/u carbon beam.

Journal Articles

Measurement of deposit energy distribution of heavy ions using a wall-less tissue equivalent proportional counter

Tsuda, Shuichi; Sato, Tatsuhiko; Satoh, Daiki; Takahashi, Fumiaki; Sasaki, Shinichi*; Namito, Yoshihito*; Sanami, Toshiya*; Saito, Kiwamu*; Takada, Masashi*

HIMAC-136, p.219 - 220, 2011/11

Measurements of lineal energy distribution were employed using 160 MeV proton and 490 MeV/u Si. The calculated $$yf(y)$$ by PHITS and $$overline{y}_D$$ agree fairly well with those measured. The LET dependence of $$overline{y}_D$$ was obtained from 3 to 300 keV/um in this project.

Journal Articles

Analysis of the effect of structural materials in a wall-less tissue-equivalent proportional counter irradiated by 290 MeV u$$^{-1}$$ carbon beam

Tsuda, Shuichi; Sato, Tatsuhiko; Takahashi, Fumiaki; Satoh, Daiki; Endo, Akira; Sasaki, Shinichi*; Namito, Yoshihito*; Iwase, Hiroshi*; Ban, Shuichi*; Takada, Masashi*

Radiation Protection Dosimetry, 143(2-4), p.450 - 454, 2011/02

 Times Cited Count:5 Percentile:41.32(Environmental Sciences)

A wall-less tissue equivalent proportional counter, wall-less TEPC, has been designed and used for the measurement of the y distributions for energetic heavy ions in order to verify a biological dose calculation model incorporated in the PHITS code. It is found that the dose-mean value of y obtained by the wall-less TEPC is 50 - 60% of the LET of the argon ions in water, since the delta-rays with relatively low y can be measured.

Journal Articles

Measurement of microdosimetric spectra with a wall-less tissue-equivalent proportional counter for 290 MeV/u $$^{12}$$C beam

Tsuda, Shuichi; Sato, Tatsuhiko; Takahashi, Fumiaki; Satoh, Daiki; Endo, Akira; Sasaki, Shinichi*; Namito, Yoshihito*; Iwase, Hiroshi*; Ban, Shuichi*; Takada, Masashi*

Physics in Medicine & Biology, 55(17), p.5089 - 5101, 2010/09

 Times Cited Count:21 Percentile:59.14(Engineering, Biomedical)

The frequency distribution of the lineal energy of 290 MeV/u carbon beam was measured using a wall-less tissue equivalent proportional counter (wall-less TEPC) in a cylindrical volume with simulated diameter 0.72 $$mu$$m in verifying the accuracy of a dose calculation model. The measured lineal energy distribution as well as its dose-mean value agreed fairly well with the corresponding data from microdosimetric calculations using the PHITS code within the experimental uncertainty. It is found that a wall-less TEPC is needed to measure the precise energy deposition spectra of the delta rays produced secondarily by energetic heavy ion beams. The measured data also indicate that more than 11% of the energy escaped from the path of the trajectory of the carbon beam.

Journal Articles

Measurement of deposit energy distribution of heavy ions using a wall-less tissue equivalent proportional counter

Tsuda, Shuichi; Sato, Tatsuhiko; Satoh, Daiki; Takahashi, Fumiaki; Endo, Akira; Sasaki, Shinichi*; Namito, Yoshihito*; Sanami, Toshiya*; Saito, Kiwamu*; Takada, Masashi*

HIMAC-134 (CD-ROM), p.227 - 228, 2010/06

no abstracts in English

Journal Articles

Measurement of lineal energy distribution by a wall-less tissue equivalent proportional counter for heavy ion beams

Tsuda, Shuichi; Sato, Tatsuhiko; Takahashi, Fumiaki; Satoh, Daiki; Endo, Akira; Sasaki, Shinichi*; Namito, Yoshihito*; Iwase, Hiroshi*; Ban, Shuichi*; Takada, Masashi*

KEK Proceedings 2009-12, p.36 - 44, 2010/01

Knowledge of energy deposition at micrometer dimensions along heavy ion tracks is essential to understand the biological effects of radiation. Wall-less tissue equivalent proportional counter (wall-less TEPC) was produced for the purpose of measurement of lineal energy distribution including secondary-produced high-energy electrons, delta-rays. The measurement using the wall-less TEPC was performed at Heavy Ion Medical Accelerator at NIRS, Japan. It is found that lineal energy distributions could be measured for primary carbon beam with energy of 400MeV per nucleon and delta-rays. Detail of the experiment, energy calibration and estimation of delta-rays production will be presented.

Journal Articles

Evaluation of delta-rays production in a wall-less tissue equivalent proportional counter irradiated by energetic heavy ion beams

Tsuda, Shuichi; Sato, Tatsuhiko; Iwase, Hiroshi*; Namito, Yoshihito*; Sasaki, Shinichi*

KEK Proceedings 2009-6, p.90 - 95, 2009/11

Deposit energy distributions of secondary high-energy electrons, delta-rays, have been calculated in a wall/wall-less tissue equivalent proportional counter, TEPC, using Monte Carlo simulation code EGS5. It is found that wall-less TEPCs are indispensable for lineal energy distribution in tissue equivalent gas irradiated by energetic heavy ion beams.

Journal Articles

Measurement of deposit energy distribution of heavy ions using a wall-less tissue equivalent proportional counter

Tsuda, Shuichi; Sato, Tatsuhiko; Satoh, Daiki; Takahashi, Fumiaki; Endo, Akira; Sasaki, Shinichi*; Namito, Yoshihito*; Sanami, Toshiya*; Saito, Kiwamu*; Takada, Masashi*

NIRS-M-226, HIMAC-132, p.264 - 265, 2009/06

A wall-less tissue equivalent proportional counter was designed and applied to measuring deposit energy distribution of heavy ion beams, including the contribution of delta-rays produced along heavy ion tracks. Lineal energy distributions were obtained for 400 MeV/u carbon and 490 MeV/u silicon beams.

Journal Articles

Measurement of glass dosimeter response for low energy photon using synchrotron radiation

Asano, Yoshihiro; Sasamoto, Nobuo; Nakane, Yoshihiro; Nakashima, Hiroshi; Sakamoto, Yukio; Tanaka, Shunichi; Namito, Yoshihito*; Ban, Shuichi*; Hirayama, Hideo*; Nariyama, Nobuteru*

IRPA9: 1996 International Congress on Radiation Protection, Proceedings, p.4_253 - 4_255, 1996/00

no abstracts in English

Journal Articles

Compton scattering of 20- to 40-keV photons

Namito, Yoshihito*; Ban, Shuichi*; Hirayama, Hideo*; Nariyama, Nobuteru*; Nakashima, Hiroshi; Nakane, Yoshihiro; Sakamoto, Yukio; Sasamoto, Nobuo; Asano, Yoshihiro; Tanaka, Shunichi

Physical Review A, 51(4), p.3036 - 3043, 1995/04

A1995-0091.pdf:0.43MB

 Times Cited Count:53 Percentile:91.18(Optics)

no abstracts in English

Journal Articles

Absorbed dose measurements and calculations in phantoms for 1.5 to 50keV photons

*; Tanaka, Shunichi; Nakane, Yoshihiro; Namito, Yoshihito*; Hirayama, Hideo*; Ban, Shuichi*;

Health Physics, 68(2), p.253 - 260, 1995/02

 Times Cited Count:9 Percentile:67(Environmental Sciences)

no abstracts in English

Journal Articles

Characteristics of a vaccum-type microcalorimeter for synchrotron-radiation measurements

; Nakane, Yoshihiro; Sakamoto, Yukio; Asano, Yoshihiro; Tanaka, Shunichi; Ban, Shuichi*; Namito, Yoshihito*; Hirayama, Hideo*; *

Nuclear Instruments and Methods in Physics Research A, 365, p.553 - 558, 1995/00

 Times Cited Count:2 Percentile:32.52(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Development of a microcalorimeter for measuring absolute intensity of synchrotron radiation

; Tanaka, Shunichi; Yoshizawa, Michio; Hirayama, Hideo*; Ban, Shuichi*; Namito, Yoshihito*; *

Nuclear Instruments and Methods in Physics Research A, 310, p.696 - 702, 1991/00

 Times Cited Count:14 Percentile:80.73(Instruments & Instrumentation)

no abstracts in English

JAEA Reports

Fusion neutron shielding benchmark problems

*; Sasamoto, Nobuo; Mori, Seiji*; *; Kawai, Masayoshi*; *; Sakurai, Kiyoshi; Shin, Kazuo*; Sekimoto, Hiroshi*; Oyama, Yukio; et al.

JAERI-M 87-203, 230 Pages, 1987/12

JAERI-M-87-203.pdf:4.46MB

no abstracts in English

Oral presentation

Design and performance tests of a wall-less tissue equivalent proportional counter for microdosimetry

Tsuda, Shuichi; Sato, Tatsuhiko; Endo, Akira; Satoh, Daiki; Takahashi, Fumiaki; Sasaki, Shinichi*; Namito, Yoshihito*; Iwase, Hiroshi*; Ban, Shuichi*; Takada, Masashi*

no journal, , 

Energy deposition of secondary charged particles produced in tissue irradiated by heavy ion beams is important information in order to evaluate biological effects of cells. In this study a wall-less tissue equivalent proportional counter (wall-less TEPC) was designed and its performance tests have been carried out using checking sources such as a Cm-244 $$alpha$$ source. It is found that the wall-less TEPC can be used in measurements of energy deposition in tissue irradiated by heavy ion beams, based on measurements of gas gain in tissue equivalent gas and lineal energy distributions.

Oral presentation

Measurement of lineal energy distributions by a wall-less tissue equivalent proportional counter using 400 MeV/u carbon beam

Tsuda, Shuichi; Sato, Tatsuhiko; Takahashi, Fumiaki; Satoh, Daiki; Endo, Akira; Sasaki, Shinichi*; Namito, Yoshihito*; Iwase, Hiroshi*; Ban, Shuichi*; Takada, Masashi*

no journal, , 

Knowledge of energy deposition at micrometer dimensions along heavy ion tracks is essential to understand the biological effects of radiation. Wall-less tissue equivalent proportional counter (TEPC) was produced for the purpose of measurement of lineal energy distribution of delta-rays. The measurement using the TEPC was performed at Heavy Ion Medical Accelerator at NIRS, Japan. It is found that lineal energy distributions could be measured for primary carbon beam with energy of 400MeV per nucleon and delta-rays. Detail of the experiment, energy calibration and estimation of delta-rays production will be presented.

Oral presentation

Measurement of lineal energy distribution of 290 MeV/u carbon beam using a wall-less tissue equivalent proportional counter

Tsuda, Shuichi; Sato, Tatsuhiko; Satoh, Daiki; Takahashi, Fumiaki; Sasaki, Shinichi*; Namito, Yoshihito*; Iwase, Hiroshi*; Ban, Shuichi*; Takada, Masashi*

no journal, , 

The frequency distribution of the lineal energy, y, of 290 MeV/u carbon beam was measured to obtain the dosed-mean of y and compare it with the linear energy transfer, LET. In the experiment a wall-less tissue equivalent proportional counter, TEPC, in a cylindrical volume with simulated diameter 0.72 micrometer was used. The measured frequency distribution of y as well as its dose-mean value agrees fairly well with the corresponding data from microdosimetric calculations using the PHITS code within the experimental uncertainty. The ratio of the measured dose-mean lineal energy to the LET of the 290 MeV/u carbon beam is 0.73, which is much smaller than the corresponding data obtained by a wall TEPC. This result demonstrates that a wall-less TEPC is necessary to precisely measure the dose-mean of y for energetic heavy ion beams.

Oral presentation

Measurements of lineal energy distributions of various energetic heavy ion beams using a wall-less tissue equivalent proportional counter

Tsuda, Shuichi; Sato, Tatsuhiko; Takahashi, Fumiaki; Satoh, Daiki; Sasaki, Shinichi*; Namito, Yoshihito*; Iwase, Hiroshi*; Ban, Shuichi*; Takada, Masashi*

no journal, , 

Deposit energy distribution in microscopic site is basic information for understanding of biological effects of energetic heavy ion beams. To estimate RBE, lineal energy, y, can be an appropriate physical index. In this work, a wall-less tissue equivalent proportional counter has been designed and used for the measurement of y distributions, yf(y), for 160 MeV H, 150 MeV/u He, 290 MeV/u C, 490 MeV/u Si and 500 MeV/u Ar. Data of yf(y) were also obtained in the wide range of LET. The dose-means of y, yD, were compared with those calculated by the microdosimetric function of PHITS. It is found that the calculated yf(y) and yD agree fairly well with those measured. The values of yD are larger than those of LET less than 10 keV/um because of the discrete energy deposition by delta rays, while the relation is reversed above 10 keV/um. The results indicate that care should be taken in the difference between yD and LET when the values of RBE of energetic heavy ions are estimated.

24 (Records 1-20 displayed on this page)