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 .
Strontium-90 (90 Sr) is the most important, with a half-life of 29 years. It is a product of nuclear fallout and its presence can cause health problems. This isotope is one of the best long-lived high-energy beta emitters known, and is used in SNAP (Systems for Nuclear Auxiliary Power) devices.trontium-90 (90 Sr) is the most important, with a half-life of 29 years. It is a product of nuclear fallout and its presence can cause health problems. This isotope is one of the best long-lived high-energy beta emitters known, and is used in SNAP (Systems for Nuclear Auxiliary Power) devices.