A) gamma camera
B) CAT scan
C) radiotracer technique
D) gamma ray spectroscopy
Correct Answer: C
Solution :
The radiotracer group applies a variety of techniques involving radioactive atoms as tracers for diffusion studies. In the classical radiotracer technique, radioactive isotopes of the element whose diffusion is to be investigated are deposited on the specimen surface. Then the specimen is diffusion annealed in a furnace, at the temperature \[T\] at which the diffusion coefficient is to be measured. From the radioactivity of the taken-off layers the penetration profile of the radiotracers which results from diffusion for the time \[t\] at the temperature \[T\] may be reconstructed. A comparison of this with the radiotracer distribution prior, to diffusion annealing yields the diffusion coefficient. This is an important diagnostic tool. A gamma camera is an imaging device most commonly used as a medical imaging device in nuclear medicine. It produces images of the distribution of gamma ray emitting radionuclides. While \[CAT\] (Computed axial tomography) is a medical imaging method employing tomography where digital geometry processing is used to generate a three dimensional image of the internals.
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