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1-Definition of Alpha particle , Medicinenet.com Available at : "http://www.medterms.com/script/main/art.asp?articlekey=9642" , Accessed : 4/8/2012 2- Radiation Exposure and Contamination Available at : "http://www.merckmanuals.com/professional/injuries_poisoning/radiation_exposure_and_contamination/radiation_exposure_and_contamination.html" , Accessed : 4/8/2012
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