[en] Xenon-127 was standardized by internal gas counting using three proportional counters in a differential arrangement to eliminate edge effects. The detection efficiency of the proportional counters was calculated by considering the cascade of events following the electron capture and associated gamma transitions. Activity per unit volume was measured with 0.7% relative standard uncertainty. Gamma-ray spectrometry was performed and absolute photon emission intensities were derived. This study shows that ¹²⁷Xe could be a surrogate for ¹³³Xe for the calibration of remote radio–xenon monitoring stations. - Highlights: • ¹²⁷Xe standardized by internal gas counting using three proportional counters. • Activity per unit volume measured with 0.7% relative uncertainty. • Photon emission intensities derived using gamma-ray spectrometry. • ¹²⁷Xe could be ¹³³Xe surrogate to calibrate remote radio–xenon monitoring stations

[en] This evaluation was completed in November 2007. The literature available by October 2007 was included. Decay Scheme: ²⁵²Cf disintegrates by α emissions mainly to the ²⁴⁸Cm ground state level, and by spontaneous fission for 3,086 (8)%. In the Tables part, the data are then normalized to 96,914 (3) alpha decays. The calculated Q value of 6217 (26) keV deduced from the decay scheme data, for the α decay, is in agreement with the value of 6216,87 (4) keV from Audi et al. (2003Au03)

[en] This evaluation was completed in 2008. Literature available by January 2008 was included. Decay Scheme: ²¹⁰Bi disintegrates by beta minus emission to the ground state level of ²¹⁰Po. Weak alpha transitions to excited levels of ²⁰⁶Tl have been observed (1.40 (15) 10^-4%). Spins and parities are from the ENSDF mass-chain evaluations E. Browne (2003Br13 for A = 210). For ²⁰⁶Tl, spins and parities are from L. I. Rusinov measurements (1961Ru02)

[en] This evaluation was completed in January 2006, and the literature available at this date has been included here. Decay Scheme: ²³⁸U disintegrates by alpha emission to two excited levels and to the ground state of ²³⁴Th. Spin and half-lives of excited states are from the mass-chain evaluation of Y.A. Akovali (1983El11 and 1994Ak05 for A = 234) and F.E. Chukreev (2002Ch52 for A = 238)

[en] This evaluation was completed in 2006. This updated version was done in January 2007. The literature available by this date is included. Decay Scheme: ²²⁶Ra disintegrates by alpha emissions mainly to the 186 keV level and to the ground state level of ²²²Rn. Spin and parity are from the mass-chain evaluation of Y. A. Akovali (1996El01 and 1996Ak02). A certain number of measurements of the 186-keV gamma intensity were carried out and the adopted data set is consistent, so the deduced intensity can be considered having a good level of confidence. Therefore, the decay scheme here was built from the gamma-ray intensity measurements. A good agreement was found between the effective Q value (4870.5 (27) keV) calculated from the decay scheme data and the adopted and recommended value from Audi

[en] This evaluation was completed in 2007. Literature available by October 2007 has been included. Decay Scheme: ²¹⁰Pb disintegrates by beta minus emission to an excited level and to the ground state level of ²¹⁰Bi. A weak alpha transition to the ²⁰⁶Hg ground state has been observed (1.9 (4) 10-6%). Spins and parities are from the ENSDF mass-chain evaluations by E. Browne (2003Br13 for A = 210) and R. G. Helmer (1990He18 for A = 206). The good agreement found between the adopted Q(β^-) value of Audi and the effective Q(β^-) value of 63.9 (11) keV calculated from decay scheme data indicates the completeness and correctness of the decay scheme

[en] This evaluation was completed in 2007. Literature available by January 2007 was included. Decay Scheme: ²¹⁴Po disintegrates by alpha emissions mainly to the ground state level of ²¹⁰Pb. Spins and parities are from the mass-chain evaluation of Y. A. Akovali (1995El07 for A = 214) and E. Browne (1992Br01 and 2003Br13 for A = 210). A good agreement was found between the recommended Q value of Audi and the effective Q value (7833.24 (10) keV) calculated from decay scheme data

[en] This evaluation was completed in 2007. Literature available by January 2007 was included. The half-life value was re-evaluated in Dec. 2010 in order to include the Martz's result. Decay Scheme; ²¹⁸Po disintegrates by alpha emission mainly (99.978 (3)%) to the ground state level of ²¹⁴Pb. A weak beta minus emission (0.022 (3)%) to At-218 has been pointed out. Spin and parity are from the mass-chain evaluation of Y. A. Akovali (1987El12, 1995El08, 1998Ak04 for A = 218 and 1995El07 for A = 214) and A. K. Jain (2006Ja03 for A = 218). A good agreement was found between the recommended Q value of Audi and the effective Q value of 6113.33 (22) keV for the α branch, calculated from the decay scheme data

[en] This evaluation was completed in 2007. Literature available by January 2007 was included. Decay Scheme: ²¹⁸Rn disintegrates by alpha emissions to the 609-keV level (0.127 (7)%) and to the ground state (99.873 (7)%) of ²¹⁴Po. Spins and parities are from the mass-chain evaluation of Y. A. Akovali (1987El12, 1995El08, 1998Ak04 and 2006Ja03 for A = 218 and 1995El07 for A = 214). A good agreement was found between the recommended Q value from Audi and the effective Q value (7262.5 (20) keV) calculated from decay scheme data

[en] This evaluation was completed in 2005. Literature available by September 2005 was included. Decay Scheme: ²³⁴U disintegrates by alpha emission to excited and ground state levels of ²³⁰Th. Spin and half-lives of excited states are from the mass-chain evaluation of Y.A. Akovali (1993Ak02 to A = 230, and 1994Ak05 to A = 234)