You cannot get definitive proof. Ionization is the process where the charge is changed in an atom. This may or may not change the properties of the gene effected.How do you prove genetic mutation was from artifical radiation, background radiation, free radicals in the air or food, etc? Having said that it is highly suspect that exposure to ionizing radiation may cause cancer.This is true with all cancers. You cannot definitively prove that something will cause cancer. Like smoking, the mutation introduced may not initiate cancer. However, more exposure may cause that unlucky mutation that starts the process.
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