In English, there are no inflectional prefixes. Prefixes, like all other affixes, are bound morphemes. The word prefix is itself made up of the stem fix (meaning attach, in this case), and the prefix pre- (meaning before), both of which are derived from Latin roots. prefix is an affix which is placed before the stem of a word. Adding it to the beginning of one word changes it into another word. For example, when the prefix un-is added to the word happy, it creates the word unhappy.
Gamma rays are the most dangerous. Externally, gamma radiation is dangerous because it can penetrate the body. Alpha is most dangerous if ingested. gamma if you're counting external damage, and alpha if you're counting internal. The type of radiation with the most penetrating capabilities is  gamma radiation. It is a form of ionizing radiation .
There are three types of ionizing radiation as classified by scientists based on how hard it is to stop the waves or particles. 1  Alpha radiation is the easiest to stop as it can be stopped by paper. 2  Beta radiation is a bit more difficult to stop and requires metal to stop it, though the metal can be thin.