Final answer:
Alpha radiation consists of helium nuclei, beta radiation consists of electrons or positrons, and gamma radiation is a form of electromagnetic radiation.
Step-by-step explanation:
The three types of radiation mentioned in the question are beta, gamma, and alpha.
Alpha radiation consists of helium nuclei and has a positive charge. It is the least penetrating type of radiation and can be stopped by a sheet of paper or a few centimeters of air.
Beta radiation is composed of electrons or positrons and has a negative charge. It is more penetrating than alpha radiation and can be blocked by a few millimeters of aluminum.
Gamma radiation is a form of electromagnetic radiation, similar to X-rays and visible light. Gamma rays have no charge and are highly penetrating, requiring several meters of concrete or a few centimeters of lead to block them.
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