SOME GAMMA-RAY SHIELDING PROPERTIES OF FINITE STEEL SLABS

Technical Report · Tue Jan 21 04:00:00 EST 1964

OSTI ID:4029035

Langer, G E; Shumway, B W

Some gamma shielding properties of plane steel slabs placed between a point source and a point detector were investigated. The dose buildup (B/sub r/- 1) resulting from 8 by 9 ft slabs 0.25, 1.00, and 1.50 in. thick (0.36, 1.45, and 2.17 mean free paths) placed between a Cs/sup 137/ point source and a small hemispherical ionization chamber was measured. The distance from the source to the detector was 16 ft. Each slab was placed at five selected points between the source and the detector in order to observe the variation in B/sub r/ -1 with slab position. The dose buildup due solely to singly scattered photons was calculated both for the 8 by 9 ft slabs and for slabs of infinlte extent. The measured values of dose buildup are compared with the calculations. A similar set of measurements was made for 1.25-Mev photons incident upon steel slabs 0.25 and 0.75 in. thick (0.26 and 0.78 mean free paths). The distance from the source to the detector was 25 ft for these measurements. The effect of interchanging two separated slabs of different thicknesses was measured for two slab pairs; one 0.25 and 0.75 in. thick, the other 0.50 and 1.00 in thick. Dose buildup due to separated slab pairs was measured. It was also estimated from single slab data, and the results were compared. (auth)

• Research Organization: Naval Radiological Defense Lab., San Francisco
• NSA Number: NSA-18-019259
• OSTI ID: 4029035
• Report Number(s): USNRDL-TR-707; AD-433658
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
BUILDUP
CESIUM 137
CONFIGURATION
CROSS SECTIONS
GAMMA DETECTION
GAMMA RADIATION
GAMMA SOURCES
IONIZATION CHAMBERS
MEAN FREE PATH
MEASURED VALUES
NUMERICALS
PHOTONS
PHYSICS
PLATES
RADIATION DETECTORS
RADIATION DOSES
RADIATIONS
SCATTERING
SHIELDING
STEELS
THICKNESS