The Attenuation of Gamma Rays at Oblique Incidence

Gamma Radiation Absorption Characteristics of Concrete with Components of Different Type Materials

“…Also provided is the transmission curve presented Dunster's [5] data are quoted as being based. Kirn's results [6] were obtained entirely experimentally.…”

“…The basic configuration was used consisting of a large cylindrical block of shielding material located in front of a small cylindrical region of air that acted as a dosimetric volume, with the front face of shield exposed to a plane parallel photon source. The 0.511 MeV source was of prime interest, though calculations were also performed for 0.662 MeV photons corresponding to Cs-137 in order to check the FOTELP results against available measurement data [5,6,9].…”

“…Firstly, the attenuation of 0.511 MeV and 0.662 MeV photons by concrete is considered, and results compared with the standard measured data provided in the literature [5][6][7]. Good agreement is taken to indicate that the chosen Monte Carlo method may be employed to make additional calculations on the attenuation of sources with different energies, a capability particularly useful in cases where no analogous experimental data exist.…”

Transmission of Gamma-Rays from 60Co Monodirectional Source through Slabs of Polyethylene and Iron

“…diameter by 5-in. long Nai(Tl) scintillator<' 7 l. The pulse-height distribution was divided into 72 ke v intervals to accord with the pulseheight intervals of the response function rnatrix, and this is designated as P 1 • The response corrected spectrum n, is obtained as ( 1) where M,;' is the inverse matrix of the response function matrix M, 1 • N, (x, 8), was obtained after the normalization of n, per incident photon, per MeV and per steradian.…”

“…They are classified into three groups: (1) photons directly incident to the scintillator at 8 = 80° and in some cases of 8 = 60° and 70°;…”