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Subject: Re: X-Rays Infos.
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Date: 05/11/01 at 11:44 PM
Posted by: Mike Gray
In Reply to: Re: X-Rays Infos. posted by Aria Kamandanu on 05/11/01 at 9:22 PM:
Aria,I can answer your question based on my knowledge of X-ray tubes that are used in Dental X-ray machines. The X-ray wavelength is a function of the target material (usually Tungsten) and the magnitude of the applied voltage. For example, when 70KV is applied to an X-ray tube, the highest photon energy of the resulting X-ray beam can not exceed 70KeV. The total energy spectrum is produced from two types of atomic interactions. One type, known as brehmstralung (braking radiation) produces the majority of the X-ray spectrum. The other type is known as Characteristic radiation, which occurs due to the atomic number of the target material. Electrons from the cathode collide with electrons in the atomic (k) shell of the target material. This produces a rather narrow line in the spectrum. So, to answer your question, you can alter the wavelength by changing the applied voltage to the X-ray tube. The "quantity" or magnitude of the X-ray beam is controled by the X-ray tube current (m.A.). The shape of the beam can be altered mechanically by placing filtration material in the X-ray beam path. Filtration "hardens" the resulting beam by attenuating the lower energy portion of the spectrum.I hope this answers your question. Regards,Mike Gray
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