DOSIMETRY AND MEASURED DIFFERENTIAL W VALUES OF AIR FOR HEAVY-IONS

被引：51

作者：

KANAI, T ^{[1
]}

KOHNO, T ^{[1
]}

MINOHARA, S ^{[1
]}

SUDOU, M ^{[1
]}

TAKADA, E ^{[1
]}

SOGA, F ^{[1
]}

KAWACHI, K ^{[1
]}

FUKUMURA, A ^{[1
]}

机构：

[1] NATL INST RADIOL SCI,DIV PHYS,CHIBA 263,JAPAN

来源：

RADIATION RESEARCH | 1993年 / 135卷 / 03期

关键词：

D O I：

10.2307/3578867

中图分类号：

Q [生物科学];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Heavy-ion irradiation systems were designed and constructed at two cyclotron facilities in Japan for use in various fields of radiation physics and radiation biology. A 135 MeV/u carbon beam as well as 12 MeV/u carbon and helium-3 beams were first used in experiments. We have established a systematic method for heavy-ion dosimetry at both high and low incident energies involving measurements of fluences. We also obtained differential W values (w) of air for those beams by comparing the results of fluence measurement dosimetry with ionization chamber dosimetry. The differential W values of air were found to be 36.2 ± 1.0, 34.5 ± 1.0, and 33.7 ± 0.9 eV for 6.7 MeV/u carbon ions, 10.3 MeV/u 3He ions, and 129.4 MeV/u carbon ions, respectively. The w value for high-energy heavy ions approaches the W value for high-energy electron or photon beams. In ionization chamber dosimetry for a heavy-ion beam, we found a track-size effect. A difference in the track sizes of heavy ions in the gas and solid phases affected the output current of the ion chamber in the case of high-energy heavy ions.

引用

页码：293 / 301

页数：9

共 20 条

[1] EFFECT OF DIFFERENT IONIZING RADIATIONS ON HUMAN CELLS IN TISSUE CULTURE .2. BIOLOGICAL EXPERIMENTS [J].