Work on thorium is also in progress. India has the largest reserves of thorium in the world. Thorium is a promising material for India's nuclear power program. More than 250 radioisotopes used in agriculture, industry, medicine and biology are now made available in large quantities. Today, over 350 radioisotopes and other radioisotope products are produced to meet a countrywide demand and also for export purposes.
Radioisotopes play an important role in the study of the functions of a normal human body.