These present the recommended values of decay parameters of many common radionuclides routinely used for X-ray and gamma-ray detector efficiency calibration. The data are the result of the work of an IAEA Coordinated Research Project 1986 to 1990 with the following participants: W.Bambynek, T.Barta, P.Christmas, N.Coursol, K.Debertin, R.G.Helmer, R.Jedlovszky, A.L.Nichols, F.J.Schima, Y.Yoshizawa, and with A.Lorenz and H.D.Lemmel as IAEA Scientific Secretaries. The work has been published in IAEA-TECDOC-619 (1991). A PC program 'XG Standards' is available. This presents for the selected radionuclides three tables for the recommended standard values and uncertainties (standard deviations) of their IAEA Readme file half-lives, energies and emission probabilities of X-rays, and energies and emission probabilities of gamma-rays. The data are shown in either nuclide sort or energy sort. Users who want to use only some of the radionuclides, may mark their preferred nuclides so that they obtain a selective retrieval either on the screen or on the printer. The following are available for download on this site: To save these files to disk, 'Right-click' on the link and select 'Save Target as...' Spreadsheet combining all three IAEA files The IAEA files in ASCII text format and Comma-Separated-Value format. Download the IAEA 'XG Standards' Program (93.6 kB) Be aware that this data has been superseded by the XGAMMA data reproduced in Appendix B.

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