The Environmental program of the Cernavoda NPP （nuclear power plant） is based on the analysis of environmental samples： airborne, TLDs （thermoluminescence dosimeters）, water, deposition, soil, grass, sediment, fi...The Environmental program of the Cernavoda NPP （nuclear power plant） is based on the analysis of environmental samples： airborne, TLDs （thermoluminescence dosimeters）, water, deposition, soil, grass, sediment, fish, milk, meat, eggs, grains, fruits and vegetables, using determination of 3H and 14C, gross alpha/beta and gamma spectrometry measurement techniques. This Program is a legal constraint for nuclear utilities and it is approved and supervised by the regulatory body. Besides, the actual legal requirements, Cernavoda NPP participates in a CANDU （Canadian Deuterium Uranium） Owners Group Project （COG HS ＆ E-304） in order to implement the new standard CAN-CSA 288.1-08 for derived emission limits using results of measurements for OBT （organically bound tritium） concentrations in plant and animal products. The method for determination of 3H and 14C in organic samples after separation through non-catalytic combustion by flame oxidation is performed in Sample Oxidizer 307 equipment. Average values for total tritium activity concentration in fish samples of 21 ± 2 Bq/kg fresh weight were determined. Results for 14C have an average value of 327 ± 26 Bq/kg-C in fish from Danube-River and 315 ± 25 Bq/kg-C in fish from lakes. The average values for 14C activity concentration in vegetables samples from Cernavoda and Seimeni areas are about 338 ± 27 Bq/kg-C.展开更多
通过加速器质谱 C 法测年和不平衡铀系热电离质谱(TIMS)法测年结果的对比, 结合已发表的 1414C 法测年结果和对应的日历年代, 研究了特定的洞穴次生碳酸盐沉积中“死碳”混入比例及其对 C ...通过加速器质谱 C 法测年和不平衡铀系热电离质谱(TIMS)法测年结果的对比, 结合已发表的 1414C 法测年结果和对应的日历年代, 研究了特定的洞穴次生碳酸盐沉积中“死碳”混入比例及其对 C 14法测年的影响. 结果表明, 洞穴次生碳酸盐中“死碳”混入比例变化较大; “死碳”混入比例的不确定使得洞穴次生碳酸盐的 C 法测年结果具有较大的误差. 在对经过老灰岩地层形成的洞穴石笋样品进行 C 14 14或 AMS14C 法定年时, 要充分考虑“死碳”对年龄可靠性的影响.展开更多
文摘The Environmental program of the Cernavoda NPP （nuclear power plant） is based on the analysis of environmental samples： airborne, TLDs （thermoluminescence dosimeters）, water, deposition, soil, grass, sediment, fish, milk, meat, eggs, grains, fruits and vegetables, using determination of 3H and 14C, gross alpha/beta and gamma spectrometry measurement techniques. This Program is a legal constraint for nuclear utilities and it is approved and supervised by the regulatory body. Besides, the actual legal requirements, Cernavoda NPP participates in a CANDU （Canadian Deuterium Uranium） Owners Group Project （COG HS ＆ E-304） in order to implement the new standard CAN-CSA 288.1-08 for derived emission limits using results of measurements for OBT （organically bound tritium） concentrations in plant and animal products. The method for determination of 3H and 14C in organic samples after separation through non-catalytic combustion by flame oxidation is performed in Sample Oxidizer 307 equipment. Average values for total tritium activity concentration in fish samples of 21 ± 2 Bq/kg fresh weight were determined. Results for 14C have an average value of 327 ± 26 Bq/kg-C in fish from Danube-River and 315 ± 25 Bq/kg-C in fish from lakes. The average values for 14C activity concentration in vegetables samples from Cernavoda and Seimeni areas are about 338 ± 27 Bq/kg-C.
