Radioactive nuclei that are injected into a patient collect at certain sites within its body, undergoing radioactive decay and emitting electromagnetic radiation. These radiations can then be recorded by a detector. This procedure provides an important diagnostic tool called
A. Gamma ray
B. CAT scan
C. Radiotracer technique
D. Gamma ray spectroscopy

Hint: A radioactive nuclei injected into a patient gets collected at some sites within the body where radioactive decay undergoes. And it emits electromagnetic radiation. This radiation can be recorded by an detector.



Complete answer:
In this process a radioactive nuclei is injected into a patient to collect some places into a body of the patient where radioactive disintegration takes place and it emits an electromagnetic radiation. This radiation can be recorded by a detector. That detector name is called radiotracers. And this type of process is known as radiotracer technique.
This technique is a common application of radioisotopes. It is a radioactive element whose path is through which a chemical reaction can be followed. These types of tracers are commonly used in the medical field and in the study of plants and animals.
Radioactive Iodine-131 can be used to study the process of the thyroid gland assisting in detecting diseases. Application of radiotracers is a radioactive element: equipment that gives the pathway through a chemical reaction can be followed by the help of tracers. We can follow the path of chemical reactions that tracers are commonly used in the medical field.
Hence, the correct answer is option C


Note: The emission of radiation by radiotracers is commonly easy to detect and measure with high precision. The emission of radiation is independent of pressure, temperature, chemical state and physical state. And this type of radiotracers are not affected by the system and can be mainly used in nondestructive techniques.