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Which is related t o the power being delivered. In X-ray work the photon energy is more important than the electrical power being used, so that peak voltages are stated, their designation being in a form such as 200 k V . p e a k. R o o t mean square and peak values are related by the expression: R . M . S . = Ä V2 = 141-4 k V . F o r example 200 k V . —The number of electrons making ' h e a d o n ' collisions and thus being brought t o rest at once—thus emitting the maximumenergy photon—will be very small.

26 B, in which it will be seen that the general pattern of the variation of intensity with p h o t o n energy is not unlike that shown in Fig. 23. A more precise agreement is hardly t o be expected from so simplified a representation of such a complicated process, and especi­ ally as there is another effect which has not been taken into account. So far n o 50 T H E P R O D U C T I O N OF X-RAYS cognizance has been taken of what might happen to the radiation as it passes, as it must, through the wall of the tube.

The most common result of proton bombardment of nuclei is the capture of the proton and the ejection of a neutron—the ' p - n ' reaction. For example, if sulphur 34 is bombarded with protons the chlorine isotope of mass 34 is produced: 5SS + ÍP -> Jja + Jn. This chlorine isotope is radioactive and, since it has fewer neutrons than in the stable isotope, it gives out positrons. It should also be noted that the product of this 34 34 reaction ( C1) is a different substance than the irradiated material ( S).

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