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Publikováno v:
International Journal of Pressure Vessels and Piping. 32:105-196
This paper is a companion document to the third revision of the CEGB procedures for the ‘Assessment of the Integrity of Structures Containing Defects’, R6, and provides background information and validation. The background information includes de
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 269:392-403
A prototype positron emission tomography (PET) system has been designed for high-resolution imaging of small volumes. The detectors use Pb converter stacks and multiwire proportional counters (MWPC); the data acquisition components and image reconstr
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 273:911-915
To investigate the use of a thick microchannel plate as a converter to detect and locate 511 keV photons, we have performed model calculations to optimize hole size, spacing and glass material. The results indicate a potential for greater than 10% de
Autor:
S.M. Kim, A.T. Stewart
Publikováno v:
Physical Review B. 11:2490-2499
The momentum distribution of photon pairs from positrons annihilating in lithium, sodium, potassium, and rubidium has been measured over a wide temperature range. The results were analyzed to yield the momentum dependence of the enhancement factor, p
Autor:
A.T Stewart, J.W Martin
Publikováno v:
Acta Metallurgica. 23:1-7
An electron microscope study has been made of the dislocation arrays produced in the vicinity of second-phase particles in aluminium crystals, using an alloy of Al-0.5 wt.% Si-0.45 wt.% Cu aged to contain equiaxed silicon particles. At low temperatur
Publikováno v:
International Journal of Pressure Vessels and Piping. 32:3-104
A number of methods are now available for assessing the integrity of structures containing flaws in all loading regimes. In this paper one of these methods is used to define a route for establishing the integrity of a structure containing defects. It
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 234:191-197
The efficiency of a 11.3 mm thick microchannel plate detector for detecting gamma rays from positron annihilation (511 keV) has been measured as 3.6%. The time resolution was less than 1 ns. Model calculations indicate that a more optimum hole geomet
Autor:
A.T. Stewart
Publikováno v:
Engineering Fracture Mechanics. 13:463-478
Fatigue crack propagation at low stress intensities has been studied in two low alloy steels in a variety of environments with particular emphasis being placed on the influence of stress ratio and strength level. It was found that fatigue crack growt