By Arnold Emch
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Extra info for An Introduction to Projective Geometry and Its Applications: An Analytic and Synthetic Treatment
The emulsions are silver halide in gelatin, as in ordinary photographic film. For radiography, the film is normally used with an intensifying screen pressed into good contact on either side of the film. For very low X-ray voltages (below 40kV) no intensifying screens are necessary. 3mm) usually mounted on card. Table 3 shows the appropriate screen thicknesses for different radiations. Lead intensifying screens absorb some of the incident X-rays and emit electrons into the film emulsion: they enable exposure times to be shortened by a factor of between two and six, with only a very small, almost unnoticeable, loss in image quality.
A radiograph is made by opening an aperture in the container or pushing out the gamma-ray source on a flexible cable once the container has been put in position. There are three basic designs of source container (sometimes called ‘gamma-ray camera’), shown schematically in Fig. 10-13. The most efficient weight-for-safety is obtained by using very dense metal for construction, and most containers are made of lead, depleted uranium or tungsten alloy. Lead containers, however, may not meet all the radioactive material transport regulations in some countries.
Lead intensifying screens absorb some of the incident X-rays and emit electrons into the film emulsion: they enable exposure times to be shortened by a factor of between two and six, with only a very small, almost unnoticeable, loss in image quality. Salt intensifying screens (fluorescent screens), usually consisting of a layer of calcium tungstate, absorb X-rays and emit ultraviolet (UV) light. They have a very large intensifying effect (between x20 and x100) and are extensively used in medical radiography.
An Introduction to Projective Geometry and Its Applications: An Analytic and Synthetic Treatment by Arnold Emch