1. NAME AND TITLE OF DATA LIBRARY

DECAYGAM: Radionuclide Gamma-Ray Energy and Intensity Compilation.

2. NAME AND TITLE OF DATA RETRIEVAL PROGRAMS

NUCDAT: Edit Program for Reading, Listing, and Editing Data on Magnetic Tape and Cards.

DKDATA: Subroutine for Retrieving Radionuclide Gamma-Ray Decay Data.

3. CONTRIBUTOR

Oak Ridge National Laboratory, Oak Ridge, Tennessee.

4. HISTORICAL BACKGROUND AND INFORMATION

Because of a need at Oak Ridge National Laboratory to resolve complex high-resolution gamma-ray spectra, an effort was begun to collect a modern computer-readable library of gamma-ray energies and intensities. The data were collected on punched cards and, over a period of time, underwent many revisions. The present version available on magnetic tape represents a collection from many sources and includes some unpublished compilations of the Oak Ridge National Laboratory Nuclear Data Project. In addition to energies and intensities, the library includes natural abundances of stable nuclides from which radionuclides may be formed, half-lives, 2200 meter/sec cross sections, fission yields, and other quantities necessary for gamma-ray spectroscopy.

5. APPLICATION OF THE DATA

Radionuclide decay data have many applications. This compilation contains, for those radionuclides tablulated, all necessary data for qualitatively and quantitatively measuring photon-emitting radionuclides as well as conducting activation analysis using gamma-ray spectrometry. The data are thus especially useful in these areas of endeavor. Gamma-ray energy and intensity data are necessary for shielding and gamma-ray heating calculations. Environmental dose calculations also depend on these data.

6. SOURCE AND SCOPE OF DATA

The sources of the data are recorded as Hollerith records on magnetic tape along with the data for each radionuclide. Presently, the data are tabulated for 514 radionuclides. Where possible, the intensity data have an absolute normalization; in some cases, however, the normalization is relative.

7. DISCUSSION OF THE DATA RETRIEVAL PROGRAMS

NUCDAT will read data from magnetic tape or cards, generate a new data tape from cards and produce a listing in two main tables. Table I is an unmodified listing of the input information arranged according to increasing atomic number. For each atomic number, entries are arranged by increasing mass number. Table II, whose listing is optional, consists of a sorted list of the most intense gamma rays arranged according to increasing energy. Listed also in Table II, along with each gamma-ray energy, is the radionuclide to which the gamma ray belongs, its half-life, type of radionuclide, and energies and intensities for several of the most intense gamma rays emitted by the radionuclide. These associated gamma rays are arranged by decreasing intensity to enable gamma-ray spectroscopists to easily compare lines in spectra with the most intense tabulated energies and, thus, rapidly identify the components of "unknown" spectra.

DKDATA is a subroutine which returns to the calling program information concerning the gamma-ray decay characteristics of a nuclide of specified atomic number and mass. This data is initially read from DLC-19/DECAYGAM on first entry to the subroutine and the pertinent data for all nuclides of interest are stored for use in subsequent calls.

8. DATA FORMAT COMPUTER

BCD/EBCDIC card images; IBM 360/370.

9. TYPICAL RUNNING TIME

To compile NUCDAT and edit the entire DECAYGAM library requires 1 minute on the IBM 360/91 computer. The DKDATA sample problem runs in 18 seconds on the IBM 361/75 computer.

10. REFERENCES

F. F. Dyer and L. C. Bate, "A Compilation of Modern Nuclear Decay Data for High Resolution Gamma Spectroscopy," Nuclear Data in Science and Technology, Vol. II, IAEA-SM-170 (1973).

F. F. Dyer, "Input Instructions for the NUCDAT Retrieval Program for SLC-19/DECAYGAM," Informal note (February 1973).

J. W. Wachter, DKDATA: Subroutinne for Retrieving Radionuclide Gamma-Ray Decay Data from RSIC Data Set DLC-19/DECAYGAM, ORNL-TM-4095 (February 1973).

F. F. Dyer and L. C. Bate, "Nuclear Data - Energies and Branching Ratios."

11. CONTENTS OF LIBRARY

Included are the referenced documents and a reel of magnetic tape which contains the library written in BCD card images, the source code and sample problem innput written in EBCDIC or mixed card images, plus output from the sample prolems; total records 20,995.

12. DATE OF ABSTRACT

March 1973; reviewed May 1984.