By using active carbon powder as ionization enhance matter, the detect sensitivity of 239Pu ,which was 0.5 pg (1±0.15, 95% confidence level), was about 20 times that of the tradition method. The sub-picogram plut...By using active carbon powder as ionization enhance matter, the detect sensitivity of 239Pu ,which was 0.5 pg (1±0.15, 95% confidence level), was about 20 times that of the tradition method. The sub-picogram plutonium sample was determined quantitatively by isotope dilution mass spectrometry (IDMS).展开更多
The method about determination isotope ratio in 1ng Uranium and 100pg Plutonium samples has been developed by using IDMS with high isotope abundance spike 233U and 242Pu. The isotope ratio uncertainty in 1ng Uranium a...The method about determination isotope ratio in 1ng Uranium and 100pg Plutonium samples has been developed by using IDMS with high isotope abundance spike 233U and 242Pu. The isotope ratio uncertainty in 1ng Uranium and 100pg Plutonium samples are about (20%, and it was mainly contributed by isotope ratio uncertainty of blend and spike. The blend and spike contamination from natural Uranium must be care in experiments.展开更多
The isotopic abundance ratios for Pu at 6.7 pg level were measured by thermal surface ionization mass spectrometry (TIMS). During the preparation of Pu samples carbon power was used as an emitting and stabilizing reag...The isotopic abundance ratios for Pu at 6.7 pg level were measured by thermal surface ionization mass spectrometry (TIMS). During the preparation of Pu samples carbon power was used as an emitting and stabilizing reagent, which increase the collection efficiency, the ion current intense and the ion emission stability for Pu. The measurment results indicate that the relative standard deviation of 2.7% for the isotopic abundance ratios of 240Pu to 239Pu is achieved when the 240Pu ion current is 8-20 cps.展开更多
文摘By using active carbon powder as ionization enhance matter, the detect sensitivity of 239Pu ,which was 0.5 pg (1±0.15, 95% confidence level), was about 20 times that of the tradition method. The sub-picogram plutonium sample was determined quantitatively by isotope dilution mass spectrometry (IDMS).
文摘The method about determination isotope ratio in 1ng Uranium and 100pg Plutonium samples has been developed by using IDMS with high isotope abundance spike 233U and 242Pu. The isotope ratio uncertainty in 1ng Uranium and 100pg Plutonium samples are about (20%, and it was mainly contributed by isotope ratio uncertainty of blend and spike. The blend and spike contamination from natural Uranium must be care in experiments.
文摘The isotopic abundance ratios for Pu at 6.7 pg level were measured by thermal surface ionization mass spectrometry (TIMS). During the preparation of Pu samples carbon power was used as an emitting and stabilizing reagent, which increase the collection efficiency, the ion current intense and the ion emission stability for Pu. The measurment results indicate that the relative standard deviation of 2.7% for the isotopic abundance ratios of 240Pu to 239Pu is achieved when the 240Pu ion current is 8-20 cps.
