The’ 1/2 life of CO60 is:
**Core Concept**
The half-life of a radioactive substance, such as Cobalt-60 (Co-60), is a critical parameter that determines its duration of action in the body. Co-60 is a gamma-emitting radionuclide used in radiation therapy for cancer treatment. Understanding its half-life is essential for optimizing treatment protocols.
**Why the Correct Answer is Right**
The half-life of Co-60 is approximately 5.27 years. This means that every 5.27 years, the radioactivity of Co-60 decreases by half. This is a characteristic property of radioactive decay, governed by the laws of nuclear physics. Co-60 undergoes beta decay, emitting beta particles (electrons) and gamma rays, which are used for therapeutic purposes.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not match the known half-life of Co-60.
* **Option B:** This option is incorrect because it is a significantly shorter half-life than the actual value.
* **Option D:** This option is incorrect because it is a longer half-life than the actual value.
**Clinical Pearl / High-Yield Fact**
The half-life of a radioactive substance like Co-60 is a critical factor in radiation therapy planning, as it affects the dose rate and duration of treatment. It's essential to consider the physical properties of the radionuclide when designing treatment protocols.
**Correct Answer: C. 5.27 years.**