日本放射線安全管理学会誌
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15 巻 , 1 号
選択された号の論文の15件中1~15を表示しています
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巻頭言
第 8 期役員挨拶
第14回学術大会(筑波)
原著
  • 奥村 友紀, 前川 達郎, 図子 直城, 佐藤 文信, 清水 喜久雄, 村田 勲, 加藤 裕史, 山本 幸佳, 飯田 敏行
    15 巻 (2016) 1 号 p. 40-45
    公開日: 2016/07/26
    ジャーナル フリー
     Radiophotoluminescence (RPL) photography has been proposed for the measurement of the spatial dose distribution of high radiation fields. A pulsed UV LED floodlight was prepared as an excitation light source for the RPL photography. The fluorescence image of RPL material was observed by a gated intensified CCD camera. In a preliminary experiment, several tens of spherical RPL detectors were placed near an intense 60Co source. The pulsed UV-LED illuminator and the gated intensified camera were pulse-operated to obtain the RPL photograph of the spherical RPL detectors. The spatial dose distribution was calculated from the brightness values of obtained RPL images.
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  • 木下 哲一, 大石 晃嗣, 鳥居 和敬, 末木 啓介, 横山 明彦
    15 巻 (2016) 1 号 p. 46-51
    公開日: 2016/07/26
    ジャーナル フリー
      Distribution coefficients of strontium, cesium, uranium, plutonium and americium on pulverized mortars and aggregates were measured to estimate infiltration of such radionuclides in concretes using a model. The model was constructed based on partition equilibrium. Depth profiles for the nuclides in columns experiments were compared with that estimated with the model. Both depth profiles agree with each other. In addition, we estimated the depth profiles for the nuclides in concrete. According to the model, the atoms of Sr infiltrate much deeply in mortar than the other nuclides.
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  • 清水 喜久雄, 中嶋 隆登, 松尾 陽一郎, 日高 雄二, 佐藤 典仁, 山本 幸佳
    15 巻 (2016) 1 号 p. 52-58
    公開日: 2016/07/26
    ジャーナル フリー
     The biological dosemeter that directly reflects cellular responses to ionizing radiations in living organisms would be useful for the protection of human health against exposures. We are aiming at developing a novel dosimetric system using DNA molecules as a radiation sensor. DNA molecules are irradiated and the resulting DNA damages are quantified by real-time PCR (quantitative PCR, qPCR) reactions.
     We investigated DNA lesions caused by gamma ray or carbon ion particle irradiation and revealed that the extent of DNA amplification negatively correlated with the greatness of LET of exposed radiations. While ionizing radiations elicit not only DNA strand breaks but 8-hydroxy-2′-deoxyguanosine (8-OHdG) production, the amount of 8-OHdG produced by the high-LET carbon ion particle irradiation was at a similar level to that by low-LET gamma ray irradiation, demonstrating that 8-OHdG production was not affected by the greatness of LET. These results suggest that the extent of DNA strand breaks, not the amount of base damages such as 8-OHdG, is influenced by the greatness of LET and causes negative effect on DNA amplification.
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  • 中島 絵梨華, 佐藤 斉, 中島 修一, 五反田 留見
    15 巻 (2016) 1 号 p. 59-65
    公開日: 2016/07/26
    ジャーナル フリー
     The system of automatically adjusting an appropriate radiopharmaceutical dose for nuclear medicine examinations was developed in this study.
     This system can calculate appropriate radiopharmaceutical dose on the base of a guideline, and adjust the quantity of solution in syringe by inputting some patient information and the substance of examination. And adjusted the quantity of solution, the text data are saved as information on PC. Further the label for pasting on syringe is outputted with a printer. The difference between the quantity of solution in syringe filled at dispenser and the calculated volume with PC is 2% or less, and it was shown that it is satisfactory in the practical needs. This system is efficient of a quality assurance of nuclear medicine examinations.
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  • 大久保 徹, 府川 和弘, 野村 貴美
    15 巻 (2016) 1 号 p. 66-73
    公開日: 2016/07/26
    ジャーナル フリー
     The energy spectra and dose equivalent rates (H1cm and H70μm) of direct and scattered X-rays from various targets of X-ray generation equipment were measured by three kinds of radiation monitors: an ionizing chamber, a GM survey meter and a CdTe semiconductor.
     The effective energies of direct X-rays from Cr and Cu targets applied at 40 kV are 8.1 keV and 11.6 keV, respectively, which are larger by about 2-3 keV than the energy of each characteristic Kα X-ray. The effective energies of direct X-ray from Mo, Ag and W targets at 40 kV are 17.1 keV, 14.5 keV and 13.4 keV, respectively, which are lower than the energy of each characteristic Kα X-ray. On the other hands, the effective energies of scattered X-rays from all targets are almost the same (12.4±0.34 keV) because the scattered X-rays are affected by fluorescent X-rays of Pb and Sn on shielding glass. The calibration factors to convert from count rates to dose equivalent rates (H1cm and H70μm) were obtained for a wide mouthed GM survey meter and a CdTe semiconductor. The above results enable us to easily estimate the low dose equivalent rates for leaked or scattered X-rays of X-ray generation instruments.
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  • 西 弘大, 松田 尚樹, 三浦 美和, 林田 りか, 山内 基弘, 平川 美弥子, 高尾 秀明, 工藤 崇
    15 巻 (2016) 1 号 p. 74-79
    公開日: 2016/07/26
    ジャーナル フリー
     Nagasaki University Radioisotope Research Center introduced a small-animal PET/SPECT/CT imaging system as new technology for biomedical research using radioisotopes in 2012. From 2014, the new support system has been operated to promote molecular imaging research, including an assignment of specialist, consultation for protocol set-up, public relations, and technical assistance. The molecular imaging system with those supports resulted in the increases of machine operating rate, the number of machine users, the amount of radioisotopes received, and revenue by facility fee. New research achievements by molecular imaging technology were also found as international publications, reports in scientific meetings, and research budgets. Introduction of PET/SPECT coupled with intensive support seems to provide an effective approach to expand the demand of the radioisotope along with to enhance frontier research activities.
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