Because alpha rays have high enerhy
so it was used for its purpose is not served sent imformation is not available from coven
so it is not used 
it also damages humans if touched and requires more inputs of electricity
frequncy plays a major role 
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For scannings x rays are used.The alpha rays have different frequency and wavelength.and alpha rays have high energy.I will cause of big problems in human.i want higher electricity..

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