By G.J.van der Plaats, P. Vijlbrief
By way of Professor J. H. Middlemiss, division of Radiodiagnosis, The scientific university, college of Bristol This ebook, for thus lengthy and so deservedly, has been a favorite and trustworthy consultant for anyone present process education in diagnostic radiology even if that individual be physician or technician. This new, mostly re-written version is much more comprehen sive. And but during the booklet simplicity of presentation is maintained. Professor G. J. van der Plaats has been renowned to radiologists within the English conversing international for greater than 3 many years. He has been, and nonetheless is, revered via them for his imaginative and prescient, his thoroughness, decision and meticulous recognition to element and for his unremitting enthusiasm. the normal of radiography within the Netherlands all through this era has been recognized as being of the very best quality, and this has, in no small degree, been end result of the development set through Professor van der Plaats and his colleagues.
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Extra resources for Medical X-Ray Techniques in Diagnostic Radiology: A Textbook for Radiographers and Radiological Technicians
06 nm (20 ke V) attenuation due to absorption accounts for 70 per cent and that due to scatter 30 per cent. 4 keV) attenuation due to absorption is more than 90 per cent. These figures are valid for monochromatic radiation. However, in practice X-ray beams produced in X-ray tubes consist of radiation composed of a great number of wavelengths (that form the continuous spectrum). In order to apply the figures to such beams, one must take as the average hardness of the beam the one that corresponds to a third of the highest (peak) voltage, that is kVp:3.
This phenomenon is known as fluorescence. Some of these substances continue to emit light for a certain length of time after bombardment by photons or electrons has ceased; this phenomenon is called phosphorescence. Both phenomena are included in the concept luminescence. It is the luminescent property of these substances that enables our eye to perceive the, for us, invisible X-rays. Not all the luminescent substances emit light of wavelengths to which our eye is sensitive. 1).
It can be deduced from the laws that govern collisions, that the recoil electron will always be projected in a forward direction at an angle between 9° and 90°, while the new quantum, after collision with the electron, is directed either obliquely forward, sideways, or (with a head-on collision) even backwards. 4). 4 Change of wavelength as a consequence of the nature of the collision. a. Oblique collision. ', travels forward in an oblique direction, just like the electron e. b. Head-on collision with the electron e.