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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
161

Estudo das reflexões de ordens superiores em cristais monocromadores de nêutrons

Fulfaro, Roberto 15 July 1970 (has links)
Orientador: Marcello Damy de Souza Santos / Tese (doutorado) - Universidade Estadual de Campinas / Made available in DSpace on 2018-07-15T13:10:48Z (GMT). No. of bitstreams: 1 Fulfaro_Roberto_D.pdf: 2608603 bytes, checksum: 29203370be5cf8da70d0f1073150b98d (MD5) Previous issue date: 1970 / Resumo: Não informado / Abstract: Not informed. / Doutorado / Física / Doutor em Ciências
162

Microdosimetry for a fast neutron therapy beam

Binns, Peter Justin 24 August 2017 (has links)
No description available.
163

Inactivation synergy between high energy neutrons and ⁶⁰Co gamma rays

Slabbert, Jacobus Petrus January 1993 (has links)
The interaction between sublesions produced by neutrons [p(66)/Be and d(16)/Be] and ⁶⁰Co γ-rays was investigated using mammalian cells, meristematic cells and human lymphocytes. The quality of each radiation source was quantified in terms of molecular yield per unit dose absorbed in a ferrous sulphate xylenol orange solution and was found to vary inversely with the mean LET of the radiation field. Inactivation parameters determined for mammalian and meristematic cells were not significantly different following simultaneous or sequential exposures to d(16)/Be neutrons and ⁶⁰Co γ-rays. Synergistic interaction was observed to be most pronounced in a radiation mixture consisting of about one part neutrons and three parts photons and appeared to be optimal at approximately 5 Gy. This phenomenon led to dose enhancement ratios that increase with radioresistance. Multi-target parameters indicated that on a per gray basis, priming doses of p(66)/Be neutrons and ⁶⁰Co γ-rays induce comparative levels of sublethal damage. However, non-parametric analysis of the survival data showed that mammalian cells regard a priming dose of neutrons as somewhat less effective than an iso-effective photon dose. A greater measure of synergy was observed between photons and priming doses of neutrons with less build-up. This is however mainly due to higher levels of biological damage induced with a more potent configuration of secondary charged particles. Interaction factors compared at levels of iso-effect tend to be smaller when the LET of the priming dose was increased. Split-doses of neutrons in the absence of build-up resulted in "negative" repair. The validity of proposed biophysical models was tested using meristematic cells, as the response of these cells show an apparent absence of intertrack damage. Contrary to expectations, synergistic interaction was observed for both growth delay measurements and micronuclear formations. Chromosome aberrations showed synergy between neutron and photon damage in human lymphocytes, as predicted by interaction functi ons. However, the synergistic interaction noted with micronuclear formation in binucleate cells was at variance with predictions based on biophysical models.
164

Energy correlations of prompt neutrons from 252Cf fission

Whittal, David Mark January 1983 (has links)
Measurements have been made of the neutron-neutron energy correlations for coincident neutrons emitted in the spontaneous fission of ²⁵²Cf. The hypothesis that cooling of the fission fragments during the cascade evaporation of prompt neutrons affects the energies of successive neutrons in a cascade has been investigated by a comparison of the energy correlations of coincident neutrons from the same fragment with those of coincident neutrons from opposite fragments in the same fission. It is found that the energies of coincident neutrons are posftively correlated and that the correlation coefficient is greater for neutrons from opposite fragments than for neutrons from the same fragment. This provides a sensitive test of the nature of neutron emission in an evaporation cascade. The energy correlations of random (noncoincidental) neutrons have also been investigated and are found to show similar but smaller correlation trends. It is concluded that there is some evidence for the cascade cooling effect on the energies of prompt fission neutrons.
165

The attenuation of very cold neutrons by titanium foil /

Gabriel, Philip Demitri. January 1981 (has links)
No description available.
166

Neutron fluences by numerical simulation and activation analysis

Kovalski, Shlomo. January 1983 (has links)
No description available.
167

Studies of nuclei with the collective model of the nucleus and intermediate coupling /

Redmond, Robert Francis January 1961 (has links)
No description available.
168

A neutron diffraction study of nickelous oxide /

Murray, David Owen January 1962 (has links)
No description available.
169

Experimental and mathematical simulation techniques for determining an in-situ response testing method for neutron sensors used in reactor power plant protection systems /

Behbahani, Alireza January 1983 (has links)
No description available.
170

A neutron and x-ray diffraction determination of the structure and amplitudes of thermal motion in crystalline aluminum chloride hexahydrate /

Buchanan, David Royal January 1962 (has links)
No description available.

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