Accession Number : AD0652794

Title :   NEUTRON FLUXES IN CONCRETE DUCTS DUE TO INCIDENT EPICADMIUM NEUTRONS: CALCULATIONS AND EXPERIMENTS,

Corporate Author : OAK RIDGE NATIONAL LAB TENN

Personal Author(s) : Maerker,R. E. ; Muckenthaler,F. J.

Report Date : 17 MAY 1967

Pagination or Media Count : 45

Abstract : Monte Carlo calculations were carried out to determine subcadmium and epicadmium neutron flux distributions along the center line of a straight, a two-legged, and a three-legged square concrete duct arising from the slowing down of incident epicadmium neutrons for a particularly demanding source geometry and spectrum. The calculations used albedo data differential both in the reflected angles and reflected energy which were reported previously for concrete (See AD-642 522 and AD-649 617). A comparison of the results of these calculations with those from a geometrically similar experiment shows good agreement and places on a firm foundation the concept of treating neutron slowing down in a concrete duct as a reflection phenomenon at a point which is describable by the differential albedo properties of the walls. The conclusion is also reached that the dose rates arising from the subcadmium neutrons (whether due to an epicadmium source or a subcadmium source) and associated secondary wall capture gamma rays can comprise a very important part of the total absorbed dose rate in tissue deep inside a multi-legged duct. (Author)

Descriptors :   (*NEUTRON FLUX, *DUCTS), SHIELDING, THERMAL NEUTRONS, DISTRIBUTION, MONTE CARLO METHOD, ALBEDO, REFLECTION, DOSE RATE, NEUTRON CAPTURE GAMMA RAYS

Subject Categories : Nuclear Radiation Shield, Protection & Safety

Distribution Statement : APPROVED FOR PUBLIC RELEASE