By G.J.van der Plaats, P. Vijlbrief
by 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 anybody present process education in diagnostic radiology even if that individual be health care professional or technician. This new, mostly re-written variation is much more comprehen sive. And but through the booklet simplicity of presentation is maintained. Professor G. J. van der Plaats has been renowned to radiologists within the English conversing global for greater than 3 a long time. He has been, and nonetheless is, revered by means of them for his imaginative and prescient, his thoroughness, selection and meticulous consciousness to aspect and for his unremitting enthusiasm. the normal of radiography within the Netherlands all through this era has been regarded as being of the very best quality, and this has, in no small degree, been as a result of the trend set via Professor van der Plaats and his colleagues.
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Additional info for Medical X-Ray Techniques in Diagnostic Radiology
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). 48 Medical X-ray Techniques Luminescence can be explained as follows.
By connecting several of these rods in series the required rectification is achieved. It goes without saying that apart from having the correct number of cells one must be sure that they are of sufficiently high quality to prevent 'breakdown'. In this respect a silicon rectifier is better than a selenium rectifier, since the first does not depend on temperature to any great extent, it does not produce a serious drop in voltage and has a longer life. The rectifier is mounted either in plate form inside the X-ray transformer or in a form which is very similar to that of a glass valve tube.
With only a few kilovolts potential difference between anode and cathode the beam of electrons passes easily through the valve, and Xrays are not produced at the anode. A valve in the circuit thus produces little resistance and thus causes relatively little loss in voltage. It is important that: (1) The current is allowed to pass in one direction only (the function of the valve)! (2) The low voltage across the valve does not cause X-rays to be produced at the anode. It should be noted that, according to convention, the electric current travels from 'plus' to 'minus', that is, from the anode to the cathode.