In the present work, we have measured the radon gas concentrations in tap water samples are taken directly from drinking tap water in sites houses being carried in Thi-Qar governorate by using nuclear track detector (...In the present work, we have measured the radon gas concentrations in tap water samples are taken directly from drinking tap water in sites houses being carried in Thi-Qar governorate by using nuclear track detector (CR-39). The results of measurements have shown that the highest average radon concentration in water samples is found in AL-Refai region which is equal to (0.223 ± 0.03 Bq/L), while the lowest average radon gas concentration is found in AL-Fajr region which is equal to (0.108 ± 0.01 Bq/L), with an average value of (0.175 ± 0.03 Bq/L). The highest value of annual effective dose (AED) in tap water samples is found in AL-Refai region, which is equal to (0.814 μSv/y), while the lowest value of (AED) is found in AL-Fajr region which is equal to (0.394 μSv/y), with an average value of (0.640 ± 0.1 μSv/y). The present results have shown that radon gas concentrations in tap water samples are less than the recommended international value (11.1 Bq/L). There for tap water in all the studied sites in Thi-Qar governorate is safe as for as radon concentration being concerned.展开更多
The feasibility of probing solid state nuclear tracks by thermal analysis method is discussed both theoretically and experimentally.Comparison is made between the thermal analysis method and the optical microscope met...The feasibility of probing solid state nuclear tracks by thermal analysis method is discussed both theoretically and experimentally.Comparison is made between the thermal analysis method and the optical microscope method,and it is demonstrated that this thermal analysis method is applicable to probing solid state nuclear tracks.展开更多
A new measurement method of thermal analysis for solid state nuclear tracks is proposed.The annealing heat emitted by the unit mass of solid state nuclear tracks in heavy particles of the sample is determined via micr...A new measurement method of thermal analysis for solid state nuclear tracks is proposed.The annealing heat emitted by the unit mass of solid state nuclear tracks in heavy particles of the sample is determined via micro-thermal analysis method.Hence,the number of solid state nuclear tracks in the unit mass of sample is determined.In particular,this paper introduces the method and its significance to measure the number of α-particles nuclear tracks in apatite by measuring the annealing heat of α-particles nuclear tracks.In addition,the mechanism of the measurement and potential applications are discussed.展开更多
For a passive radon detector of Solid State Nuclear Track Detector(SSNTD),the measurement results can be affected under an environment of high humidity.In order to correct this kind of measurement errors,experiments i...For a passive radon detector of Solid State Nuclear Track Detector(SSNTD),the measurement results can be affected under an environment of high humidity.In order to correct this kind of measurement errors,experiments in normal radon laboratory were performed.The track films were etched in 6.25 mol/L NaOH solution at 70°C for 12 h,and rinsed with water for 6 h.The experiment results show that calibration factor of the SSNTD decreased with increasing humidity,because of increased stopping power of the moisture-absorbed film surface to αparticles.Therefore,the calibration factor K should be corrected from the calculated result.展开更多
本文给出了一种采用固体核径迹探测器测量低能(0.5 e V以下能量)中子的双片径迹计数方法,利用蒙特卡罗模拟和实验,统计分析了低能中子引起的探测器单位面积径迹密度。结果显示,采用双片径迹计数方法,实现了CR39对于低能中子的响应,可以...本文给出了一种采用固体核径迹探测器测量低能(0.5 e V以下能量)中子的双片径迹计数方法,利用蒙特卡罗模拟和实验,统计分析了低能中子引起的探测器单位面积径迹密度。结果显示,采用双片径迹计数方法,实现了CR39对于低能中子的响应,可以对低能中子引起的个人剂量进行估算。应用在中子职业个人剂量监测时,有效甄别了背景径迹的影响,因而降低了测量误差,对减小中子个人剂量监测的测量不确定度也是一个可行的方法。展开更多
文摘In the present work, we have measured the radon gas concentrations in tap water samples are taken directly from drinking tap water in sites houses being carried in Thi-Qar governorate by using nuclear track detector (CR-39). The results of measurements have shown that the highest average radon concentration in water samples is found in AL-Refai region which is equal to (0.223 ± 0.03 Bq/L), while the lowest average radon gas concentration is found in AL-Fajr region which is equal to (0.108 ± 0.01 Bq/L), with an average value of (0.175 ± 0.03 Bq/L). The highest value of annual effective dose (AED) in tap water samples is found in AL-Refai region, which is equal to (0.814 μSv/y), while the lowest value of (AED) is found in AL-Fajr region which is equal to (0.394 μSv/y), with an average value of (0.640 ± 0.1 μSv/y). The present results have shown that radon gas concentrations in tap water samples are less than the recommended international value (11.1 Bq/L). There for tap water in all the studied sites in Thi-Qar governorate is safe as for as radon concentration being concerned.
文摘The feasibility of probing solid state nuclear tracks by thermal analysis method is discussed both theoretically and experimentally.Comparison is made between the thermal analysis method and the optical microscope method,and it is demonstrated that this thermal analysis method is applicable to probing solid state nuclear tracks.
基金Supported by the Natural Science Foundation of Shaanxi Province (Grant No. SJ08-A26)
文摘A new measurement method of thermal analysis for solid state nuclear tracks is proposed.The annealing heat emitted by the unit mass of solid state nuclear tracks in heavy particles of the sample is determined via micro-thermal analysis method.Hence,the number of solid state nuclear tracks in the unit mass of sample is determined.In particular,this paper introduces the method and its significance to measure the number of α-particles nuclear tracks in apatite by measuring the annealing heat of α-particles nuclear tracks.In addition,the mechanism of the measurement and potential applications are discussed.
文摘For a passive radon detector of Solid State Nuclear Track Detector(SSNTD),the measurement results can be affected under an environment of high humidity.In order to correct this kind of measurement errors,experiments in normal radon laboratory were performed.The track films were etched in 6.25 mol/L NaOH solution at 70°C for 12 h,and rinsed with water for 6 h.The experiment results show that calibration factor of the SSNTD decreased with increasing humidity,because of increased stopping power of the moisture-absorbed film surface to αparticles.Therefore,the calibration factor K should be corrected from the calculated result.
文摘本文给出了一种采用固体核径迹探测器测量低能(0.5 e V以下能量)中子的双片径迹计数方法,利用蒙特卡罗模拟和实验,统计分析了低能中子引起的探测器单位面积径迹密度。结果显示,采用双片径迹计数方法,实现了CR39对于低能中子的响应,可以对低能中子引起的个人剂量进行估算。应用在中子职业个人剂量监测时,有效甄别了背景径迹的影响,因而降低了测量误差,对减小中子个人剂量监测的测量不确定度也是一个可行的方法。
