本文主要是对植入科学公司生产的模型3500碘-125植入治疗粒子源的一系列剂量学特征的研究。粒子源的各个剂量学参量通过使用蒙特卡罗方法计算得到。计算模型材料采用了两种等效水:固体水和液态水。粒子源的剂量学参量如剂量率常数、径...本文主要是对植入科学公司生产的模型3500碘-125植入治疗粒子源的一系列剂量学特征的研究。粒子源的各个剂量学参量通过使用蒙特卡罗方法计算得到。计算模型材料采用了两种等效水:固体水和液态水。粒子源的剂量学参量如剂量率常数、径向剂量函数和各项异性函数等的确定依照美国医学物理学家协会(American Association of Physicists in Medicine AAPM)第43次工作报告。蒙特卡罗模拟得到液态水的剂量率为0.997 cGyh-1U-1,固态水的为1.027 cGyh-1U-1。与前同类研究比较,本次研究的剂量率常数与同类研究所报道的数据较为一致。展开更多
Natural radioactivity radionuclides in building materials, such as^(226)Ra,^(232)Th and^(40)K, cause indoor exposure due to their gamma-rays. In this research, in a standard dwelling room(5.0 m 9 4.0 m 9 2.8 m), with ...Natural radioactivity radionuclides in building materials, such as^(226)Ra,^(232)Th and^(40)K, cause indoor exposure due to their gamma-rays. In this research, in a standard dwelling room(5.0 m 9 4.0 m 9 2.8 m), with the floor covered by various granite stones, was set up to simulate the dose rates from the radionuclides using MCNP4 C code. Using samples of granite building products in Iran, activities of the^(226)Ra,^(232)Th and^(40)K were measured at 3.8–94.2, 6.5–172.2 and 556.9–1529.2 Bq kg^(-1),respectively. The simulated dose rates were26.31–184.36 n Gy h^(-1), while the measured dose rates were 27.70–204.17 n Gy h^(-1). With the results in good agreement, the simulation is suitable for any kind of dwelling places.展开更多
In this paper we study the analytical and statistical results of estimating the gamma dose rate at pool access floor in TRR when the core shield accidentally decreases to some non-permitted levels. Due to the risk of ...In this paper we study the analytical and statistical results of estimating the gamma dose rate at pool access floor in TRR when the core shield accidentally decreases to some non-permitted levels. Due to the risk of experimental techniques, we use the analytical and statistical methods. In normal conditions （no risk）, the discrepancies between experiment and two methods are justified and it is found that for such problems we have to normalize these methods to experimental results as follows： the analytical method by factor 0.13 and MCNP by 1.7.展开更多
文摘本文主要是对植入科学公司生产的模型3500碘-125植入治疗粒子源的一系列剂量学特征的研究。粒子源的各个剂量学参量通过使用蒙特卡罗方法计算得到。计算模型材料采用了两种等效水:固体水和液态水。粒子源的剂量学参量如剂量率常数、径向剂量函数和各项异性函数等的确定依照美国医学物理学家协会(American Association of Physicists in Medicine AAPM)第43次工作报告。蒙特卡罗模拟得到液态水的剂量率为0.997 cGyh-1U-1,固态水的为1.027 cGyh-1U-1。与前同类研究比较,本次研究的剂量率常数与同类研究所报道的数据较为一致。
文摘Natural radioactivity radionuclides in building materials, such as^(226)Ra,^(232)Th and^(40)K, cause indoor exposure due to their gamma-rays. In this research, in a standard dwelling room(5.0 m 9 4.0 m 9 2.8 m), with the floor covered by various granite stones, was set up to simulate the dose rates from the radionuclides using MCNP4 C code. Using samples of granite building products in Iran, activities of the^(226)Ra,^(232)Th and^(40)K were measured at 3.8–94.2, 6.5–172.2 and 556.9–1529.2 Bq kg^(-1),respectively. The simulated dose rates were26.31–184.36 n Gy h^(-1), while the measured dose rates were 27.70–204.17 n Gy h^(-1). With the results in good agreement, the simulation is suitable for any kind of dwelling places.
文摘In this paper we study the analytical and statistical results of estimating the gamma dose rate at pool access floor in TRR when the core shield accidentally decreases to some non-permitted levels. Due to the risk of experimental techniques, we use the analytical and statistical methods. In normal conditions （no risk）, the discrepancies between experiment and two methods are justified and it is found that for such problems we have to normalize these methods to experimental results as follows： the analytical method by factor 0.13 and MCNP by 1.7.
