Thesis (Ph.D.)--Delft University of Technology, 2008. / Vita. Includes bibliographical references.

The response of a 5 cm (diameter) by 5 cm cylindrical NE213 liquid scintillator to neutrons has been measured as a function of neutron energy in the range 15-63 Me V, using time-of-flight to select neutron energy. The response function at each neutron energy was separated into components associated with the emission of different charged particles, identified by pulse · shape dissimilation to be protons, deuterons, and alphas, respectively. The response (light output) of NE213 to protons, deuterons and alphas was measured as a function of energy. Furthermore, total cross sections for neutron-induced proton, deuteron, and alpha production from 12C were determined from the charged particle yields. The simultaneous presence of n-p elastic scattering in the scintillator provided a reference for establishing an absolute cross section scale for the measurements. The results give information about reaction mechanisms and provide an improved basis for determining the neutron detection efficiency of the scintillator as a function of energy over this range.

No description available.

Graduation date: 1994

No description available.

Thesis (M.S.)--University of Hawaii at Manoa, 2006. / Includes bibliographical references (leaves 38-40). / vi, 40 leaves, bound ill. 29 cm

Thesis (M.S.)--University of Michigan, 1978.

The introduction contains introductory remarks on scintillation counters together with a brief description of the exciton theory believed to be the means of primary energy migration within organic crystals. Part I contains a review of the data published on the reletive responses of different organic crystals and the attempted correlations of these results with the molecular structures of the different phosphors. From data which may be accepted as being both reliable and suitable for comparison it is concluded that theories involving correlations between phosphor efficiencies and molecular structures may be tested only if the efficiency data has (i) been extrapolated to give results for crystals of very small thickness and {ii) been obtained at very low temperatures. Part II contains accurate calculations based on the exciton theory proposed by Birks (1951 ) to account for the response of crystals to different types of ionising radiations. Satisfactory agreement is obta1ned with all the avalable experimental data in the literature. In part III an account is given of the response of organic crystals observed by the author for low-energy ⋉particles, and of the similar behaviour found by Taylor et al, (1951 ) for low-energy electrons. A possible extension of the theory described in part II, allowing for the escape of excitons through the crystal surface is given accounting for this behaviour. An exciton mean free path in anthracene, terphenyl and stilbene of about 3 - 7/u is obtained. Results were obtained with strong ⋉-particle sources which could not be explained. in terms ot normal response of the phosphor used. This effect was inventigatea as described in part IV, and it is shown that photons are produced in air, glass and quartz when these materials are irradiated by ⋉particles. This luminescence was probably responsible for the "scintillations" which Richards and Cole (1951) have ascribed to thin films of various materials. Problems requiring further investigation are indicated.

No description available.

by Chan Chi-Ming. / Chinese title in romanization: Zai zhong zi-r she xian hun he chang zhong, yong you ji shan yue ti ce liang zhong zi tong liang di fang fa. / Thesis (M.Ph.)--Chinese University of Hong Kong, 1987. / Bibliography: leaves 142-149.