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Which of the following radiations are used for imaging purposes?(a) alpha(b) beta(c) gamma(d) deltaThis question was posed to me in an online interview.The origin of the question is PET & SPECT in portion Diagnostic Investigation via Imaging Techniques of Clinical Science

Answer»

Correct answer is (c) gamma

The explanation is: Gamma rays are energy rays or photon rays and do not have a mass. Thus, they do not destroy the cancerous cells or provide any relief in therapies. HOWEVER, since they have a GREATER penetration power, they can be used for imaging. If the body is exposed to these penetrating radiations for a long time, the body may have burn and a prolonged and continuous EXPOSURE will result in damaged DNA. INCREASING the intensity of the radiations also causes harm to the body.



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