Radioactive waste from the anthropogenic nuclear activities and army/defense-related nuclear weapon activities cause many problems. It is important to handle them carefully to protect the environment as well as living organisms for a better and safe tomorrow. They are in contact with a variety of radiations. If the level of the radioactive radiations exceeds a certain limit, it can cause harmful effects to living beings. This harmful effect of radiations emitted by radioactive elements is called radioactive pollution.
The term “perovskite” was first used by Gustav Rose in 1839 when he discovered a new material based on Calcium Titanate (CaTiO3). He named this material “perovskite” after the Russian mineralogist Lev Von Perovski. The concept of perovskites was then changed to any material having a composition ABX3, and, since then, there have been a large number of discoveries of materials with the same composition. One of these has been halide perovskites based on caesium and lead.