This study presents the intercomparison of the outdoor environmental gamma dose rates measured using a Nal （TI） based survey meter along with thermoluminescent dosimeters （TLDs） and estimation of excess lifetime c...This study presents the intercomparison of the outdoor environmental gamma dose rates measured using a Nal （TI） based survey meter along with thermoluminescent dosimeters （TLDs） and estimation of excess lifetime cancer risk （ELCR）, for the inhabitants of Poonch division of the Azad Kashmir, Pakistan. CaF2： Dy （TLD-200） card dosimeters were installed at height of 1 m from ground at fifteen different locations covering the entire Poonch division comprising of three districts.展开更多
A track structure model has been applied to calculate the relative thermoluminescent efficiency of TLD- 100 irradiated with energetic heavy ions. In earlier work we proposed that the response of TLD- 100 to γ-ray ari...A track structure model has been applied to calculate the relative thermoluminescent efficiency of TLD- 100 irradiated with energetic heavy ions. In earlier work we proposed that the response of TLD- 100 to γ-ray arises from a combination of 1- hit and 2- hit trap structures. The supralinear (2- hit) response is now known to diminish with a decrease in the energy of incident electrons. Since the delta rays of slow particles are of low energy, diminishing with a reduction in ion speed, we calculate the response to slow heavy ions by track theory as due to the 1- hit targets alone and obtain good agreement between theory and experiment. The branching of the experimental curves is principally caused by the kinematic limit in delta ray production for ions approaching the end of their range, an effect which is called "thidown" when seen in the tracks of heavy ions approaching the end of their range in electron sensitive nuclear emulsion.展开更多
针对X射线辐照环境中抗辐射加固技术研究的需求,建立了一种适用于电子系统封闭外壳的X射线屏蔽效能测量方法。以X射线机的轫致辐射输出为基础,通过滤波和多个连续谱的组合,实现了接近考核能谱的辐照X射线输出;利用Li F热释光探测器的优...针对X射线辐照环境中抗辐射加固技术研究的需求,建立了一种适用于电子系统封闭外壳的X射线屏蔽效能测量方法。以X射线机的轫致辐射输出为基础,通过滤波和多个连续谱的组合,实现了接近考核能谱的辐照X射线输出;利用Li F热释光探测器的优势,研究了X射线能量响应标定和屏蔽效能测量的应用方法。重点开展了20–100 ke V硬X射线辐照下封闭腔体屏蔽效能测量的实验研究,测量结果显示,除照射方向上的穿透X射线外,散射X射线对腔体内部剂量场具有显著的贡献。通过实验方法的建立和测量结果的分析,能为X射线抗辐射加固的结构设计和有效性评估提供实验参考。展开更多
文摘This study presents the intercomparison of the outdoor environmental gamma dose rates measured using a Nal （TI） based survey meter along with thermoluminescent dosimeters （TLDs） and estimation of excess lifetime cancer risk （ELCR）, for the inhabitants of Poonch division of the Azad Kashmir, Pakistan. CaF2： Dy （TLD-200） card dosimeters were installed at height of 1 m from ground at fifteen different locations covering the entire Poonch division comprising of three districts.
文摘A track structure model has been applied to calculate the relative thermoluminescent efficiency of TLD- 100 irradiated with energetic heavy ions. In earlier work we proposed that the response of TLD- 100 to γ-ray arises from a combination of 1- hit and 2- hit trap structures. The supralinear (2- hit) response is now known to diminish with a decrease in the energy of incident electrons. Since the delta rays of slow particles are of low energy, diminishing with a reduction in ion speed, we calculate the response to slow heavy ions by track theory as due to the 1- hit targets alone and obtain good agreement between theory and experiment. The branching of the experimental curves is principally caused by the kinematic limit in delta ray production for ions approaching the end of their range, an effect which is called "thidown" when seen in the tracks of heavy ions approaching the end of their range in electron sensitive nuclear emulsion.
文摘针对X射线辐照环境中抗辐射加固技术研究的需求,建立了一种适用于电子系统封闭外壳的X射线屏蔽效能测量方法。以X射线机的轫致辐射输出为基础,通过滤波和多个连续谱的组合,实现了接近考核能谱的辐照X射线输出;利用Li F热释光探测器的优势,研究了X射线能量响应标定和屏蔽效能测量的应用方法。重点开展了20–100 ke V硬X射线辐照下封闭腔体屏蔽效能测量的实验研究,测量结果显示,除照射方向上的穿透X射线外,散射X射线对腔体内部剂量场具有显著的贡献。通过实验方法的建立和测量结果的分析,能为X射线抗辐射加固的结构设计和有效性评估提供实验参考。
