Question

Which of the following is not a current use of radioisotopes?

A. Medical diagnosis
B. sterilization of equipment
C. Detection of leaks in building structures
D. Light fixtures

Answer 1

Light Fixtures

D) Light fixtures are not current uses of radioisotopes.

Answer 2

Radiosotopes have been used in all the four fields mentioned in the options. Nevertheless, the use of radioisotopes in light fixtures has been replaced with photoluminiscent materials.

Then the answer is the option D. Light fixtures.