DLC-0093 ZZ-SKYPORT.

ZZ SKYPORT, Importance Function for Neutron and Gamma for Skyshine Dose from Accelerator

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: ZZ-SKYPORT.

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2. COMPUTERS

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Program name	Package id	Status	Status date
ZZ-SKYPORT	DLC-0093/01	Tested	21-AUG-1991

Machines used:

Package ID	Orig. computer	Test computer
DLC-0093/01	IBM PC	PC-80286

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3. DESCRIPTION OF PROGRAM OR FUNCTION

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  FORMAT: --

  NUMBER OF GROUPS: --

  NUCLIDES: Air (79%N,21%O),Ground (silicon dioxide with 5% water)

  ORIGIN: Calculations of Alsmiller, Barish and Childs

  WEIGHTING SPECTRUM: --

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The important functions are used to calculate the skyshine dose by integrating the product of the source and importance over source direction and energy. The source may be a function of energy and polar angle but must have azimuthal symmetry. Typical sources are accelerators.

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4. METHOD OF SOLUTION

The data are from calculations of Alsmiller, Barish, and Childs using the DOT and GRTUNCL codes. The neutron data are presented in 4 tables for neutrons up to 400 MeV at distances from 11 m to 1005 m. The photon data are given at the same distances for photons up to 14 MeV. The units in the tables are in sieverts per source particle, whereas the original tables were published with units of rem per source particle. Air was taken to be composed of 79% nitrogen and 21% oxygen and to have a density of 1.20 x 10-3 g/cm3. Ground was assumed to be silicon dioxide with 5% water by weight and to have a density of 1.8 g/cm3.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:

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6. TYPICAL RUNNING TIME:

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7. UNUSUAL FEATURES OF THE PROGRAM:

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8. RELATED AND AUXILIARY PROGRAMS

These importance functions were developed in conjunction with calculations at Oak Ridge National Laboratory in support of the 400-GeV proton accelerator which was partially built at Brookhaven National Laboratory in the early 1980s.

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9. STATUS

Package ID	Status date	Status
DLC-0093/01	21-AUG-1991	Tested at NEADB

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10. REFERENCES

- R.G. Alsmiller, J. Barish, and R.L. Childs:
"Skyshine at Neutron Energies Less Than 400 MeV"
Particle Accelerators, 11, 131-141 (1981).

DLC-0093/01, included references:

- R.G. Alsmiller, J. Barish, and R.L. Childs:
"Skyshine at Neutron Energies Less Than 400 MeV"
ORNL/TM-7512 Oak Ridge National Laboratory (October 1980).

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11. MACHINE REQUIREMENTS:

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12. PROGRAMMING LANGUAGE(S) USED

No item found

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

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15. NAME AND ESTABLISHMENT OF AUTHORS

Contributed by: Radiation Safety Information Computational Center
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U. S. A.

Developed by:   Continuous Electron Beam Accelerator Facility
                Newport News, Va., U. S. A.

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16. MATERIAL AVAILABLE

DLC-0093/01

File name	File description	Records
DLC0093_01.001	SKYPORT.INF Information file	178
DLC0093_01.002	ERG.DAT Energies for neutron tables	66
DLC0093_01.003	ERG2.DAT Energies for photon tables	24
DLC0093_01.004	TABLE.B1 Neutron importance for r=11m	66
DLC0093_01.005	TABLE.B2 Neutron importance for r=108m	66
DLC0093_01.006	TABLE.B3 Neutron importance for r=495m	66
DLC0093_01.007	TABLE.B4 Neutron importance for r=1005m	66
DLC0093_01.008	TABLE.B5 Photon importance for r=11m	24
DLC0093_01.009	TABLE.B6 Photon importance for r=108m	24
DLC0093_01.010	TABLE.B7 Photon importance for r=495m	24
DLC0093_01.011	TABLE.B8 Photon importance for r=1005m	24
DLC0093_01.012	DOS file-names	11

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17. CATEGORIES

G. Radiological Safety, Hazard and Accident Analysis
Z. Data.

Keywords: doses, neutron importance function.