Background A compact ^(14)C AMS system extended for ^(10)Be and ^(26)Al(XCAMS)was installed at Tianjin University in Octo-ber 2017.As an initial testing result,a detection limit of 4.4×10^(−16) for ^(14)C/^(12)C,...Background A compact ^(14)C AMS system extended for ^(10)Be and ^(26)Al(XCAMS)was installed at Tianjin University in Octo-ber 2017.As an initial testing result,a detection limit of 4.4×10^(−16) for ^(14)C/^(12)C,3.8×10^(−15) for ^(10)Be/^(9)Be and 6.9×10^(−15) for ^(26)Al/^(27)Al was achieved,respectively.Method The system was gradually smoothed and optimized based on a series of standard,blank and real samples measurement.Results The detection limit was down to 4.0×10^(−16) for ^(14)C/^(12)C,2.2×10^(−15) for ^(10)Be/^(9)Be and 5.6×10^(−15) for ^(26)Al/^(27)Al,respectively.More than one thousand samples of ^(14)C,^(10)Be and ^(26)Al have been successfully measured and analyzed.Conclusion The cosmogenic multi-nuclide of ^(14)C,^(10)Be and ^(26)Al AMS has been available for studies in archaeology,Earth science and environmental science,and some significant jobs still need to be carried out in the near future.展开更多
Introduction Accelerator mass spectrometry(AMS)has been used for the analysis of a lot nuclides in many scientific fields and is one of the most optimal methods to determine very low concentrations of long-lived nucli...Introduction Accelerator mass spectrometry(AMS)has been used for the analysis of a lot nuclides in many scientific fields and is one of the most optimal methods to determine very low concentrations of long-lived nuclides.The XCAMS system is an extension of the Compact ^(14)C Accelerator Mass Spectrometer for ^(10)Be and ^(26)Al.A description of the first Chinese XCAMS system and initial performance of three nuclides of ^(14)C,^(10)Be,and ^(26)Al,respectively,will be reported.Experimental procedures Solid sample material(graphite,Al_(2)O_(3),and BeO)is loaded into cathode holders for AMS analysis.The negatively charged ions(C−,Al−,and BeO−)are extracted and accelerated to the terminal,broken-up,and some orbital electrons stripped off to form positively charged atomic ions,and accelerated further.In the post-acceleration region,the magnetic and electrostatic devices act on momentum and energy analysis,respectively.A multi-anode detector is used for the identification and detection of relevant isotopes and isobars.System performance The test criteria of three rare isotopes each were set for beam current intensity,measurement precision,and machine background.The corresponding material and cathode holder were,respectively,used for ^(14)C,^(10)Be,and ^(26)Al test.Several batches of real sample have already been analyzed by the new AMS system based on the acceptance test results.In addition,several secondary standards were measured to check the stability of the system.Conclusion The new XCAMS facility has been installed successfully,and the latest performance also showed that the machine is reliable enough,in general.Both the hardware components and software system were in good condition for accurate and precise data analysis in the near future.展开更多
基金This work was partly supported by the National Natural Science Foundations of China(NSFC),under Grant Nos.11775157 and 11575296.
文摘Background A compact ^(14)C AMS system extended for ^(10)Be and ^(26)Al(XCAMS)was installed at Tianjin University in Octo-ber 2017.As an initial testing result,a detection limit of 4.4×10^(−16) for ^(14)C/^(12)C,3.8×10^(−15) for ^(10)Be/^(9)Be and 6.9×10^(−15) for ^(26)Al/^(27)Al was achieved,respectively.Method The system was gradually smoothed and optimized based on a series of standard,blank and real samples measurement.Results The detection limit was down to 4.0×10^(−16) for ^(14)C/^(12)C,2.2×10^(−15) for ^(10)Be/^(9)Be and 5.6×10^(−15) for ^(26)Al/^(27)Al,respectively.More than one thousand samples of ^(14)C,^(10)Be and ^(26)Al have been successfully measured and analyzed.Conclusion The cosmogenic multi-nuclide of ^(14)C,^(10)Be and ^(26)Al AMS has been available for studies in archaeology,Earth science and environmental science,and some significant jobs still need to be carried out in the near future.
基金This work was mainly supported by the National Natural Science Foundations of China(NSFC)under Grant Nos.11775157 and 11575296.
文摘Introduction Accelerator mass spectrometry(AMS)has been used for the analysis of a lot nuclides in many scientific fields and is one of the most optimal methods to determine very low concentrations of long-lived nuclides.The XCAMS system is an extension of the Compact ^(14)C Accelerator Mass Spectrometer for ^(10)Be and ^(26)Al.A description of the first Chinese XCAMS system and initial performance of three nuclides of ^(14)C,^(10)Be,and ^(26)Al,respectively,will be reported.Experimental procedures Solid sample material(graphite,Al_(2)O_(3),and BeO)is loaded into cathode holders for AMS analysis.The negatively charged ions(C−,Al−,and BeO−)are extracted and accelerated to the terminal,broken-up,and some orbital electrons stripped off to form positively charged atomic ions,and accelerated further.In the post-acceleration region,the magnetic and electrostatic devices act on momentum and energy analysis,respectively.A multi-anode detector is used for the identification and detection of relevant isotopes and isobars.System performance The test criteria of three rare isotopes each were set for beam current intensity,measurement precision,and machine background.The corresponding material and cathode holder were,respectively,used for ^(14)C,^(10)Be,and ^(26)Al test.Several batches of real sample have already been analyzed by the new AMS system based on the acceptance test results.In addition,several secondary standards were measured to check the stability of the system.Conclusion The new XCAMS facility has been installed successfully,and the latest performance also showed that the machine is reliable enough,in general.Both the hardware components and software system were in good condition for accurate and precise data analysis in the near future.
