Copyright (©) for the XG programme by Hartmut Lemmel 1991 This PC file includes the recommended values of decay parameters of selected radionuclides to be used for X-ray and gamma-ray detector efficiency cali- bration. 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). The PC diskette presents for the selected radionuclides three tables for the recommended standard values and uncertainties (standard deviations) of their 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. Notes: 1. The Greek characters gamma and eta that occur in the file, are usually not available on the screen or printer. The XG program creates these signs for certain screen types. On other screens and on printers they will show up as capital gamma (ASCII 226), respectively as an eta-similar sign (ASCII 239). 2. In the X-ray table the energy column includes energy ranges; in the table sorted by energy the mean value of the energy range is used for sorting. 3. The data tables can be edited under dBase; should this be done, they must be re-indexed: when the XG Menu is shown, press Ctrl-I. 4. The present version supersedes a preliminary version dated 91-8-6. The diskette is available upon request, free of charge, from the IAEA Nuclear Data Section, P.O. Box 100, A-1400 Vienna, Austria. The program can also be downloaded from this site. The data on the diskette is available for download from this site. The diskette contains 7 files with together 213 kbytes. XG_READ.ME HL.DBF XRAY.DBF GRAY.DBF XG.EXE XRAYE.NTX GRAYE.NTX The program is called by typing XG Enter. H.D. Lemmel 1991-12-6

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