Your friend says the helium in your birthday helium balloon comes from radioactive decays. what is your response?

I would say that the friend is saying a truth. The helium in balloons would most likely come from radioactive decays. Helium is said to be one of the common element in the Universe next to hydrogen. Helium, which is used for commercial purposes, is obtained from natural gas. It is mixed with this gas a result from radioactive decay of materials underneath the ground.