Question

Which of the following are uses of radioactive substances?

• A. Use as projectiles and tracers for various scientific studies
• B. To kill malignant tumor
• C. To make luminescent signs
• D. All of the above

Answer 1

The correct option is D All of the above

Disease such as cancer can be cured by radiation therapy in which gamma radiations of radioactive atom $cobalt-60$ are used to kill the cells of the malignant tumor in patients. The salts of weak radioactive isotopes are used to study natural processes in living things, effect of drugs on different organs etc. Such radio isotopes are called tracers. Radio isotopes are also used as projectiles to study the nuclear reactions, structure of elements etc. The ionizing effect of radiations from radio isotopes is used in making certain luminescent signs