1. NAME AND TITLE OF DATA LIBRARY

HALLMARK: Discrete Ordinates and Monte Carlo Results of Neutron and Secondary Gamma-Ray Transport in Air-Over-Ground Geometry.

2. NAME AND TITLE OF DATA RETRIEVAL PROGRAMS

REPUT: An Edit program for DOT Discrete Ordinates Neutron and Secondary Gamma-Ray Results.

DOTCOM: A Program for Combining DOT Discrete Ordinates Neutron and Secondary Gamma-Ray Results for Different Source Energies into Results for an Arbitrary Source Spectrum.

BSDPRINT: An Edit Program for O5R-ACTIFK-OGRE Neutron and Secondary Gamma-Ray Results.

BSDCOM: A Program for Combining O5R-ACTIFK-OGRE Neutron and Secondary Gamma-Ray Results for Different Source Energies into Results for an Arbitrary Source Spectrum.

ANGLE8: An Edit Program for O5R-ACTIFK Angular Dependent Neutron Results.

BSDCOM(8ANGLE): Results for an Arbitrary Source Spectrum.

3. CONTRIBUTOR

Oak Ridge National Laboratory, Oak Ridge, Tennessee.

4. HISTORICAL BACKGROUND AND INFORMATION

The DOT and O5R-ACTIFK-OGRE results for neutron and secondary gamma-ray results in air-over-ground geometry were generated by E. A. Straker of Oak Ridge National Laboratory. The results were preserved on magnetic tape and are available to those who wish to utilize them.

5. APPLICATION OF THE DATA

DLC-5/HALLMARK data can be used to study the energy, time, and angular distribution of neutrons and secondary gamma rays as a function of slant range from a point isotropic neutron source 50 feet above the air-ground interface. The data are for neutron sources in given energy bands. Some of the retrieval programs can be used to edit the data in tabular form. Other retrieval programs can combine results for various neutron source energies to give the results for a neutron source of arbitrary energy spectrum.

6. SOURCE AND SCOPE OF DATA

DLC-5/HALLMARK data are the results of Monte Carlo (CCC-17/O5R--ACTIFK--CCC-46/OGRE) and discrete ordinates (CCC-89/DOT) calculations of neutron fluxes and doses and secondary gamma-ray fluxes and doses due to a point isotropic neutron source located 50 feet in air above the ground surface. Sources of various energies up to 15 MeV were used and slant ranges up to 1500 meters were considered. The neutron source energy range from 0.111 to 15 MeV was divided into 8 non-overlapping intervals and separate calculations, in which the source was assumed constant in energy, for each interval. The discrete ordinates calculations considered one more interval from 3.3 to 111 keV in which the source was assumed to be proportional to 1/E.

Information about the composition assumed for air and ground, the source energy bands and slant ranges chosen, the angular quadrature employed, and the dose conversion factors used can be found in the packaged document.

The Monte Carlo results include time-integrated and time-dependent neutron and gamma-ray dose rate as a function of slant range. Neutron fluxes for various time and energy bins for two directions are given for each range. Gamma-ray fluxes for various time and energy bins for four directions are also given for each range. Neutron fluxes for various time and energy bins for 8 angles are given for two slant ranges: 350.3 and 975.1 meters. Fractional standard deviations for all the above quantities are included in the DLC-5/HALLMARK data. The Monte Carlo results considered distributions of neutrons with energies greater than 0.1 MeV and also the corresponding distributions of secondary gamma rays produced by inelastic scattering and fast-neutron capture. The Monte Carlo results that include the 2-direction neutron data occupy 8 files of computer tape, each file corresponding to one of the eight neutron source energy intervals studied (non-overlapping energy intervals between 0.111 and 15 MeV). The eight-direction neutron results are contained on one additional file of computer tape.

The discrete ordinates results for each of the 40 energy groups include the fluence in 40 directions for each slant range. The 40 energy groups include 22 neutron and 18 gamma-ray groups. The calculations were S₈P₃ with a total of 2790 mesh points. Neutrons of all energies were considered as well as the corresonding secondary gamma rays. The discrete ordinates results occupy 9 files of computer tape, each file corresponding to one of the 9 neutron source energy intervals studied (non-overlapping energy groups between 3.3 keV and 15 MeV).

7. DISCUSSION OF THE DATA RETRIEVAL PROGRAMS

There are six programs packaged with DLC-5/HALLMARK. An edit and a combination program are provided for each of the three types of data (9 files of discrete ordinates results, 8 files of Monte Carlo results, and 1 file of Monte Carlo results for 8 directions).

REPUT is the edit program for discrete ordinates results. It will edit any or all of the nine files of HALLMARK discrete ordinates results and will produce tables like those shown in the packaged document. It will also edit results for an arbitrary source spectrum which have been produced by DOTCOM.

DOTCOM operates on the same HALLMARK data as REPUT. It produces results for an arbitrary source spectrum, edits these results in the same format as REPUT, and will write the results on tape for later use. The fraction of source particles in each of the nine non-overlapping energy intervals is input by means of cards. The results for several different sources may be produced in the same run.

BSDPRINT edits the 8 files of HALLMARK Monte Carlo results and produces tables such as those in the packaged document. It will also edit results for an arbitrary source spectrum which have been produced by BSDCOM.

BSDCOM operates on the same HALLMARK Monte Carlo results as BSDPRINT. It produces results for an arbitrary source spectrum and punches them on cards for subsequent editing by BSDPRINT. The user specified the fraction of neutrons in each of the eight source energy intervals.

ANGLE8 is the edit program for the one file of HALLMARK eight angle Monte Carlo results. It will also edit results from BSDCOM (8ANGLE).

BSDCOM (8ANGLE) produces results for an arbitrary spectrum as specified by the user. It operates on the same HALLMARK data as ANGLE8 and punches results on cards for subsequent editing by the latter program.

8. DATA FORMAT AND COMPUTER

EBCDIC card images; IBM 360/370.

9. TYPICAL RUNNING TIME

On the IBM 360/91 computer, DLC-5/HALLMARK compiled and ran the packaged sample problems in the following times (m = minutes, cpu = central processing unit):

10. REFERENCES

E. A. Straker, "Time-Dependent Neutron and Secondary Gamma-Ray Transport in an Air-Over-Ground Geometry, Vol. II: Tabulated Data," ORNL-4289 Vol. II (September 1968).

C. L. Thompson, I. J. Brown, R. W. Roussin, "User's Manual for Programs to Edit and Combine DLC-5/HALLMARK Calculational Results of Neutron and Secondary Gamma-Ray Transport in Air-Over-Ground Geometry," ORNL-TM-3129 (September 1970).

11. CONTENTS OF LIBRARY

Included are the referenced documents and two DS/HD 5.25 (1.2MB) DOS diskettes which contain the source code and sample problem input and output, plus data for DOT and ANAL-OGRE and cross sections for DOT.

12. DATE OF ABSTRACT

September 1970; reviewed May 1984.