1 A radioactive element is an element with a stable nucleus
2 Radiates alpha beta or gamma radiation
3 Gets converted to a stable element
2 It can only be stopped by lead
3 is the weakest. it can be stopped by piece of paper
4 Cobalt-67 is useful for
1 diagnosing pernicious anemia
2 added to phosphate fertilizer to determine the exact quantity of phosphorus
3 for the diagnosis of thyroid problems
4 used to improve the production of crops both in terms of quantity as well as quantity