1.The amount of radiation from natural radioactive decay is about ________ times higher than the amount you receive from a dental x-ray.
2.The rays and particles emitted by a radioactive source are called ___________.
Expert's answer
1. 4.
2. A beta particle, also called beta ray or beta radiation (symbol β), is a high-energy, high-speed electron or positron emitted by the radioactive decay of an atomic nucleus during the process of beta decay.