Accession Number : AD0454729


Title :   GAMMA-RAY SHIELDING EFFECTS OF METAL DOORS IN DUCTS


Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA


Personal Author(s) : Bryson, P R ; Grant, J S


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/454729.pdf


Report Date : 11 Jan 1965


Pagination or Media Count : 42


Abstract : Results are presented of an experiment carried out on the shielding effects of a steel door in a twolegged 11x11-in. concrete duct using Co60 as a gamma-ray source. Two door positions and two door thicknesses were used. A relatively strong inscatter effect was measured when the door was placed at the corner where direct radiation was received. When a 3/8-in. steel door was placed in the second leg 22 in. from the corner, the radiation was reduced 50 to 60%. It can be expected that the farther down the second leg the door is placed, the less radiation it will transmit; that the thicker the door, the greater its shielding effectiveness will be. A method of scaling the results to large ducts is presented based on the experimental measurements.


Descriptors :   *GAMMA RAYS , THICKNESS , SCATTERING , EXPERIMENTAL DATA , SHELTERS , STEEL , SHIELDING , ATTENUATION , RADIATION EFFECTS , DUCT INLETS , GEIGER COUNTERS


Subject Categories : Astrophysics


Distribution Statement : APPROVED FOR PUBLIC RELEASE