IAEA-TECDOC-619 Evaluated Data
(XG Standards)

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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...'

Be aware that this data has been superseded by the XGAMMA data reproduced in Appendix B.

Appendices Data Example Spectra Links Online Course Spreadsheets Test Spectra

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