Alpha particles, which are helium nuclei, are released during radioactive decay. Radiation from the radioactive decay of uranium (U) and thorium (Th) produces helium (He) (Pb). The 4He atom's nucleus is also referred to as an alpha particle. One of the processes through which radioactive atoms finally decompose into non-radioactive elements is alpha decay. There is helium present because of alpha particles released by radioactive decay.
Because of the radioactive decay of materials buried beneath, helium is a naturally occurring gas on Earth. I will agree if my friend say that helium used to inflate balloons is a product of radioactive decay.
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