Effect factors of measurement of low abundance isotope were researched. The deduction of dynamic background was applied to the measurement of low abundant uranium isotope ratios using thermal ionization mass spectrome...Effect factors of measurement of low abundance isotope were researched. The deduction of dynamic background was applied to the measurement of low abundant uranium isotope ratios using thermal ionization mass spectrometer with multi-detector. The results showed that relative standard uncertainty of the low abundant isotopic measurementd ecreased about 50%.展开更多
The upgrade of the HIRFL post-beam line is being done. The vacuum system of the beam-line is mainly made up of the vacuum chambers, vacuum pipes, bellows, ion pumps and valves etc. After the upgrade, most of the old v...The upgrade of the HIRFL post-beam line is being done. The vacuum system of the beam-line is mainly made up of the vacuum chambers, vacuum pipes, bellows, ion pumps and valves etc. After the upgrade, most of the old vacuum devices will be reused except that a few is new. These old vacuum devices consist of 21 chambers, 22 pipes, 21 bellows, 31 ion pumps and 28 valves. The total surface area cf the old vacuum chambers and pipes is about 1.2×10-6 cm2. They were contaminated by oil vapor seriously, so, the vacuum cleaning展开更多
文摘Effect factors of measurement of low abundance isotope were researched. The deduction of dynamic background was applied to the measurement of low abundant uranium isotope ratios using thermal ionization mass spectrometer with multi-detector. The results showed that relative standard uncertainty of the low abundant isotopic measurementd ecreased about 50%.
文摘The upgrade of the HIRFL post-beam line is being done. The vacuum system of the beam-line is mainly made up of the vacuum chambers, vacuum pipes, bellows, ion pumps and valves etc. After the upgrade, most of the old vacuum devices will be reused except that a few is new. These old vacuum devices consist of 21 chambers, 22 pipes, 21 bellows, 31 ion pumps and 28 valves. The total surface area cf the old vacuum chambers and pipes is about 1.2×10-6 cm2. They were contaminated by oil vapor seriously, so, the vacuum cleaning
