1. NAME AND TITLE OF DATA LIBRARY

XG-IAEA: X-ray and Gamma-ray Standards For Detector Calibration

2. NAME AND TITLE OF DATA RETRIEVAL PROGRAMS

XG: Executable X-Ray and Gamma-Ray DBASE program.

3. CONTRIBUTORS

International Atomic Energy Agency, Vienna, Austria.

4. HISTORICAL BACKGROUND AND INFORMATION

IAEA established a Coordinated Research Program (CRP) on the Measurements and Evaluation of X- and Gamma-ray Standards for Detector Efficiency Calibration in 1986 with the aim of alleviating the generation of data discrepancies. Representatives of nine research groups and one international organization performed precise measurements and systematic in-depth evaluations of the required decay data. They have also contributed to the development of evaluation methodology and measurement techniques and stimulated a number of such studies. Results of the work finished in 1990 are incorporated in XG-IAEA data base.

5. APPLICATION OF THE DATA

Values of half-lives and photon emission probabilities are given for a selected set of radionuclides that are suitable for detector efficiency calibration.

6. SOURCE AND SCOPE OF DATA

Data were evaluated from the open literature and laboratory reports published over a considerable period of time. The eventual omission of individual values had to be justified on the basis of their quality or other specific grounds. An evaluation procedure was developed for the half-life data. This procedure was also applied to the gamma-ray emission probabilities whenever appropriate. Included for 36 selected radionuclides are three tables of recommended evaluated values and uncertainties of their half-lives; energies and emission probabilities of X-rays, energy range 5-90 keV; energies and emission probabilities of gamma-rays, energy range 14-3600 keV.

7. DISCUSSION OF THE DATA RETRIEVAL PROGRAMS

The file XG.EXE is a DBASE program. At the PC prompt, one need only type XG. The data are shown in either nuclide sort or energy sort.

8. DATA FORMAT AND COMPUTER

The data files are in DBASE format; IBM PC.

9. TYPICAL RUNNING TIME

None noted.

10. REFERENCES

H. D. Lemmel, "XG Standards," Informal Notes (1 page) (December 6, 1991).

H. D. Lemmel, "X-ray and Gamma-ray Standards for Detector Calibration," IAEA-TECDOC-619 (September 1991).

11. CONTENTS OF PACKAGE

The package contains the documents referenced, and an executable DBASE program and binary DBASE data files are transmitted on one DS/HD 5.25-inch diskette (1.2MB).

12. DATE OF ABSTRACT

September 1992.