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Patla, Nagendranath (1965) An investigation of the x-ray quantum efficiency of gaseous scintillators. Doctoral thesis, Sir John Cass College.
An experimental and theoretical investigation of the x-ray quantum efficiency of pure, noble gas scintillation counters is presented in this thesis. The range of wavelengths used is 0.2 - 2.3 Å, and the values of quantum efficiency are determined by the use of a proportional counter as a reference system. The luminophors used are spectroscopically pure inert gases, namely Neon, Argon and Krypton. Throughout the range of wavelengths used, the system using Krypton shows a higher efficiency than those using Argon and Neon - a maximum value occurring at about 1.0 Å. The variation of quantum efficiency with gas pressure has also been investigated using Argon at 0.5, 1.5 and 2.0 atmospheres over the same range of wavelengths. Tests of the behaviour of the entire system are described, and the choice of operating conditions, the principle of the measurement of an absolute value of efficiency and an x-ray photon interaction detection efficiency are discussed. To account for the variations of efficiency found, a quantitative study has been made of the processes of light emission and collection, and the relative probability of classical scattering, photoelectric effect and Compton scattering in this range of wavelength for Argon at 1.0 and 1.5 atmospheres. It is found that the efficiency of optical light emission from the excited and ionised gas atoms plays an important part in the values of quantum efficiency realised in any experiment.
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