1. NAME AND TITLE OF DATA LIBRARY
NUCDECAY: Nuclear Decay Data for
Radiation Dosimetry Calculations for ICRP and MIRD.
2. NAME AND TITLE OF DATA RETRIEVAL PROGRAMS
DEXRAX: Extracts decay data from
the library for radionuclide(s) specified by the user.
Oak Ridge National Laboratory, Oak
4. HISTORICAL BACKGROUND AND INFORMATION
The Dosimetry Research Group (DRG)
of the Health Sciences Research Division at ORNL has for several years
maintained data bases of nuclear decay data for use in dosimetric calculations.
The data on mean and unique energy plus intensity have been previously
published, in abridged form, in Publication 38 of the International Commission
on Radiological Protection (ICRP 1983) and a monograph1 for the Medical
Internal Radiation Dose (MIRD) Committee of the Society of Nuclear Medicine;
but the unabridged data included here and the beta spectra have not been
previously published. Newer decay data are available in the DLC-213/DECDC
5. APPLICATION OF THE DATA
This data base has been designed
to address the needs in medical, environmental, and occupational radiation
protection. Calculations of the spatial distribution of absorbed dose (depth-dose)
requires information on the beta spectra, and these are compiled in a separate
data file also included here. NUCDECAY is required by the CCC-620/SEECAL
program to calculate age-dependent specific effective energies.
6. SOURCE AND SCOPE OF DATA
The unabridged data used in preparing ICRP Publication 38 and a monograph of the MIRD Committee are distributed in electronic form in this package. The data are assembled in two collections. The collection referred to as ICRP38 consists of data on the energies and intensities of radiations emitted by the 825 radionuclides reported, although abridged, in ICRP Publication 38 plus an additional 13 radionuclides evaluated during preparation of a monograph for the MIRD Committee. The second collection, denoted as MIRD, contains data for the 242 radionuclides in the MIRD monograph noted above. Each collection consists of three ASCII files:
(1) the index file (ICRP38.IDX or MIRD.IDX) is a sorted list of the radionuclides with pointers into the data files.
(2) the radiation file (ICRP38.RAD or MIRD.RAD) contains data on the energies and intensities of the emitted radiations.
(3) the beta spectra file (ICRP38.BET
or MIRD.BET) contains the spectra for all beta emitters in the collection.
7. DISCUSSION OF THE DATA RETRIEVAL PROGRAM
Four utility codes are provided.
The code DEXRAX is used to extract the decay data from the library for
radionuclide(s) specified for the user. The utility CHAIN lists the decay
chain headed by a user-specified radionuclide. The RADLINE code identifies
radionuclides which emit alpha or photon radiations of a user-specified
energy. The executables and most of the source codes are provided. The
Microsoft Fortran 5 compiler was used to compile the CHAINS code and the
READDEC portion of the DEXRAX code. The full source for DEXRAX is not provided
as that implementation must be linked with two special libraries. The source
code is provided for a QBASIC version of the utility RADSUM. This version
of RADSUM does include plotting of the beta spectra or computations of
the gamma constant. Other utilities were written in Microsoft BASIC Professional
8. DATA FORMAT AND COMPUTER
ASCII; PC 386. (D00172/PC386/01)
9. TYPICAL RUNNING TIME
The codes are interactive.
a. Documentation available with library
K. F. Eckerman, R. J. Westfall, J. C. Ryman, M. Cristy, "Nuclear Decay Data files of the Dosimetry Research Group," ORNL/TM-12350 (December 1993).
K. F. Eckerman, R. J. Westfall, J. C. Ryman, and M. Cristy, "Availability of Nuclear Decay Data in Electronic Form, Including Beta Spectra not Previously Published," Health Phys. 67(4):338-345 (1994).
b. Other useful documentation
D. Weber, K. F. Eckerman, L. T.
Dillman, and J. C. Ryman, "MIRD: Radionuclide Data and Decay Schemes,"
Society of Nuclear Medicine, New York (1989).
11. CONTENTS OF LIBRARY
Included are the referenced documents
and two DS/HD 3.5-in. (1.44 MB) diskette written in compressed DOS files
which include the data library, the installation code, and the utility
12. DATE OF ABSTRACT
November 1994; revised May 1995.
KEYWORDS: BETA-RAY SPECTRA; MICROCOMPUTER; RADIOACTIVE DECAY SPECTRA; ELECTRON SPECTRA; EXTERNAL DOSE; INTERNAL DOSE; RADIONUCLIDES