CCC-0341 AIRSCAT. (Abstract last modified 18-JUN-1982)
1.
NAME OR DESIGNATION OF PROGRAM - AIRSCAT. 2.
COMPUTER FOR WHICH PROGRAM IS DESIGNED AND OTHER MACHINE VERSION PACKAGES AVAILABLE -
To request or retrieve programs click on the one of the active versions below.
A password and special authorization is required. Explanation of the status codes.
Machines used:
Package-ID Orig.Computer Test Computer
CCC-0341/01 DEC PDP-10
CCC-0341/02 CDC CYBER 174 CDC CYBER 174
3.
DESCRIPTION OF PROBLEM OR FUNCTION - Present methods of solution to determine dose rates from air-scattered gamma rays utilize the concept of multiple scattering. These methods compute many possible scattering paths to derive the desired value. One of the most used techniques is the Monte Carlo, which is quite time consuming and costly in regard to computer usage and memory size requirements. The AIRSCAT program was developed as a calculation scheme for air-scat- tered gamma rays using the single-scattering approximation with no exponential attenuation or buildup. The program has been useful for preliminary design work and estimation when dealing with unshielded detectors. The main advantage of this type of calculation is: closed form solutions, small computer memory, large time saving and lower cost as compared to the Monte Carlo methods.
4.
METHOD OF SOLUTION - The AIRSCAT program uses the once scattered component of Compton scattering to determine individual dose rate contributions at various scatter points within the scattering region. These scattering points are defined by a nonuniform scatte- ing grid, which takes advantage of the fact that the gamma ray pho- ton energy decreases as a function of the scattering angle and dis- tance from the source, thus the scattering region is biased for the most important scatter points. Once the contribution has been esta- blished for each individual scatter point, a total dose rate is de- rived by integration over the entire scattering region.
5.
RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM - The results of the AIRSCAT program, using the single scattering approximation, with no exponential attenuation or buildup, are useful for preliminary design work and estimation. The results show that the simple appro- ximation is adequate for unshielded detectors. If the detector is shielded in any way, however, these results would not be valid, since energy and angular distribution at the shield are important.
6.
TYPICAL RUNNING TIME - 7.
UNUSUAL FEATURES OF THE PROGRAM - 8.
RELATED AND AUXILIARY PROGRAMS - 9.
STATUS 10.
REFERENCES - 11.
MACHINE REQUIREMENTS - 12.
PROGRAMMING LANGUAGE(S) USED - 13.
OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED - 14.
OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS - 15.
NAME AND ESTABLISHMENT OF AUTHOR - Contributed by: 16.
MATERIAL AVAILABLE - 17.
CATEGORIES - Keywords: AIR SCATTERING, DOSE RATES, GAMMA RADIATION, IRRADIATION
Calculation of dose rate for gamma rays scattered in air.
Program-name Package-ID Status
AIRSCAT CCC-0341/01 Arrived
AIRSCAT CCC-0341/02 Tested
CCC-0341/01: 29-NOV-2001 Masterfiled Arrived
CCC-0341/02: 18-JUN-1982 Tested at NEADB
CCC-0341/01:
- A Thesis by M.C. Guile:
AIRSCAT - Calculation of Dose Rate for Gamma-rays Scattered in Air
(April 1978).
CCC-0341/02:
- A Thesis by M.C. Guile:
AIRSCAT - Calculation of Dose Rate for Gamma-rays Scattered in Air
(April 1978).
CCC-0341/01: FORTRAN-IV
CCC-0341/02: FORTRAN-IV
Worchester Politechnic Institute
Worchester, Massachusetts
received from RSIC
CCC-0341/01:
source program mag tape
report RSIC report (April 1978) REPPT
CCC-0341/02:
CCC0341_02.002 AIRSCAT INFORMATION 18 records
CCC0341_02.003 AIRSCAT, SOURCE PROGRAM (FORTRAN-4) 188 records
CCC0341_02.004 AIRSCAT, JCL FOR TEST CASE 1 5 records
CCC0341_02.005 AIRSCAT, INPUT FOR TEST CASE 1 4 records
CCC0341_02.006 AIRSCAT, OUTPUT OF TEST CASE 1 89 records
- G. Radiological Safety, Hazard and Accident Analysis
- R. Environmental and Earth Sciences
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