What is radioactive isotope? Md. Saifur Rahman There are some isotopes the nucleus of which spontaneously synthesize themselves and emit alpha, beta, gamma rays. They are called radioactive isotopes. You may likeDo I need car insurance?What is car insurance?How could I get cheaper car insurance?What is auto insurance?Why Adulterant food is the barrier to sound health?What are the producers?What are food preservatives?What is food chain?What is tertiary consumer?