Thursday, February 28, 2013

Mr S Visanji

Shabir Visanji
Access to radiography
Group 2

X ray machine and the electrical circuit in it.


FIGURE 1

In 1895, Rontgen ( German scientist) imbed that some photographic plates, kept care ampley wrapped in his laboratory, had become fogged. Instead of merely throwing them aside he lay out to attend the cause of the flogging. He traced it to a fluid-discharge piping, which he was using with a low pressure and high voltage. This pipage appeared to emit a radiation that could penetrate paper, wood, glass, rubber, and even atomic number 13 a centimetre and a half(prenominal) thick. Rontgen could not find out whether the radiation was a stream of particles or a train of waves- Newton had the same difficulty with light- and he mulish to call it X-rays.

It was later discovered that it was the electrons which were responsible for the fogging of the paper. So to agnize the X-ray work a lot of electrons were needed. Looking at the relationship of voltage(v), current(I)and subway system(R).

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which is


V=IR

Also I=V/R

The resistance (R) of the apparatus was fixed so to achieve maximum current(I) for getting large amounts of electron a large voltage (V) was needed. In 1913 William Coolidge improved the earlier designs and produced The hot cathode tube also called the Coolidge tube which is still widely used to date. From figure 1 F is the filament and T is the target, or anode. Because there is so weeny gas, the electrons on their way to the anode do not lose any(prenominal) perceptible amount of their energy in ionizing atoms. From the a.c.mains, the transformers provide or so 10 volts for heating the filament and about 100,000 volts for accelerating the electrons. On the half cycles when the target is negative, nothing happens at all-there is too little gas in the tube for it to break down. Thus the tube acts, in effect, as its own rectifier...If you want to get a full essay, order it on our website: Orderessay



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