Remeasurement of the half-life of ^(79)Se has been carried out with the projectile x-ray detection(PXD)in accelerator mass spectrometry.We made two major improvements over our earlier ^(79)Se half-life determination[N...Remeasurement of the half-life of ^(79)Se has been carried out with the projectile x-ray detection(PXD)in accelerator mass spectrometry.We made two major improvements over our earlier ^(79)Se half-life determination[Nucl.Instrum.Methods B 123(1997)403].Fristly,the PXD technique has been used for separation of ^(79)Se and 75Se from 79Br and 75As isobars respectively.Secondly,the half-life of ^(79)Se has been measured relative to the known precise half-life of ^(75)Se(119.79±0.04d).A more reliable half-life of ^(79)Se measured with the PXD technique is(2.95±0.38)×10^(5)y,about a factor of one lower than the previous value,1.1 × 10^(6)y.The problems in the previous measurement are discussed.展开更多
基金Supported in part by the Nuclear Energy Foundation of China,No.H7010101.
文摘Remeasurement of the half-life of ^(79)Se has been carried out with the projectile x-ray detection(PXD)in accelerator mass spectrometry.We made two major improvements over our earlier ^(79)Se half-life determination[Nucl.Instrum.Methods B 123(1997)403].Fristly,the PXD technique has been used for separation of ^(79)Se and 75Se from 79Br and 75As isobars respectively.Secondly,the half-life of ^(79)Se has been measured relative to the known precise half-life of ^(75)Se(119.79±0.04d).A more reliable half-life of ^(79)Se measured with the PXD technique is(2.95±0.38)×10^(5)y,about a factor of one lower than the previous value,1.1 × 10^(6)y.The problems in the previous measurement are discussed.
