Which of the following emits gamma radiations only?: (A) Strontium 89, (B) Technetium 99m, (C) Phosphorus 32, (D) Tin 117m
Answer is B. Radionuclides react with hydroxyapatite and the pattern of uptake is seen on the bone scan. Strontium-89, Samarium-153, Phosphorus -32, Rhenium-186, Tin -117m emit beta particles with a mean range between 0.2 to 3 mm, minimising toxicity to the surrounding tissues.
Technetium 99m emits gamma radiations and is used as a diagnostic tool in medical sciences.