419,563 research outputs found
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Study on Sampling Method of Nitrogen in the Forest Ecosystem
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We investigated the usefulness of Gafchromic MD-55 film (Nuclear Associates, Inc.) for measuring the radiation doses on the radiotherapy of laryngeal cancers. Since larynx has thin wedge-shaped structure in anterior neck adjacent to airway, the radiation doses to the lesion may be diminished because of build-up and build-down. So, the dose has been measured with conventional measuring systems such as thermoluminescent dosimetry (TLD). However, it was not possible to evaluate the dose distribution correctly using TLD, because it is impossible to float a TLD chip in an air cavity. In this study, we employed Gafchromic MD-55 film as a dosimeter, for it can be set on the area of interest and with a measurability of dose range of 3 to 100 Gy, though it has no energy dependency. And this radiometer is composition near the soft tissue of the human body. The dose distributions to larynx were investigated with this film using neck phantom under each radiation beam energy of 4, 6 and 10 MV x-rays. Our neck phantom is made from acrylic resin and simulates a normal larynx on the basis of image information of computed tomography (CT). Moreover we observed secondary build-up and build-down curves in tissue in the vicinity of air cavities, especially at 10 MV x-rays. These findings suggest that patients with TI-T2 glottic cancers with anterior commissure invasion may receive more effective
treatment with 4 MV x-rays rather than with 6 MV and 10 MV x-rays.Tl声éçã«å¯ŸããŠæŸå°ç·æ²»çãåç¬ã§è¡ãã®ã¯ç¢ºç«ããŠããæ¹æ³ã§ããããã,é éšã¯è§£ååŠçã«è€éã§ãã,åæ¹ã«èãâ
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å·£ãžã®ç·éã¯build-upãšbuild-downã®åœ±é¿ã«ããç·éäœäžãçããããšãèããããããªãã¡,æŸå°ç·ãšãã«ã®ãŒã®éžæãåé çã®å±æçå¶åŸ¡ã«åœ±é¿ãåãŒããšèšãããã®åœ±é¿ã¯,ããé«ãæŸå°ç·ãšãã«ã®ãŒã§ã¯,ããã«äŒŽããã匷ãèµ·ãããšããããšãåºç€å®éšã«ãŠå ±åãããŠãããŸã,ãããã®ç·é枬å®ã¯,ç±ã«ããã»ã³ã¹ç·éèš(TLD)ã®ãããªåŸæ¥ã®æž¬å®ã·ã¹ãã ã§æž¬å®ãããŠããããã,空æ°ç©ºæŽãžTLD ãåäœ
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㯠Gafchromic MD-55 film (Nuclear Associates, Inc.)ã䜿çšã枬å®ãã Gafchromic MD-55 film ã¯,ãã£ã«ã ã¿ã€ãç·éèšã§ãããšãã«ã®ãŒäŸåæ§ããªã,3ïœ100 Gyã枬å®å¯èœã§ãã,ã¢ã¯ãªã«è£œé žéšãã¡ã³ãã ã®ç©ºæ°çµç¹å¢çé¢åã³,空æŽéšã«ç·éèšã容æã«ç²ŸåºŠè¯ãé
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The roof tiles in the later period of Champa:a consideration for its origin and diffusion
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Studies on the Effects of Thinning from Small Diametered Trees (II) : Changes in stand condition after single growing season
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