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Background Shielding and Collimation by W E Kreger
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absorber absorption analyzer angular aperture approximation Argonne National Laboratory Atomic attenuation axis background beam beta boundary conditions bremsstrahlung calculated calibration cent circular polarization coefficient coincidence collimator components Compton scattering counting rate cross section curve cylindrical defined detected detector determined diam discussed distribution effect efficiency emitted equations experimental factor finite Gamma Gamma-Ray geometry given high energy incident Instr intensity interaction light pipe linear polarization low energy magnetic matrix mesons method Nal crystal Nal(Tl National Laboratory neutron capture Nucl Nuclear Nucleonics obtained pair production particles peak photocathode photoelectric photofractions photomultiplier photons phototube Phys point source polarimeter polarization measurements primary crystal problem produced pulse pulse-height radioactive ratio reduced resolution response functions scattering angle scintillation counter scintillation spectrometer secondary Shafroth shown in Fig solid angle solution spectra spectrometer spectrum techniques theoretical thickness tion tube unpublished vector y-ray circular y-ray energy