Which of the following radioistopes is used as anticancerous ?

Options

A. Na-24
B. C-14
C. U-235
D. Co-60

Explanation

To determine which radioisotope is used as an anticancerous treatment, we can analyze the options provided:

1. **Sodium-24 (Na-24)**: This isotope is primarily used in medical diagnostics and not specifically for cancer treatment.

2. **Carbon-14 (C-14)**: This isotope is commonly used in radiocarbon dating and biological studies, but it is not used for cancer treatment.

3. **Uranium-235 (U-235)**: This isotope is primarily used as fuel in nuclear reactors and for nuclear weapons, not for cancer treatment.

4. **Cobalt-60 (Co-60)**: This is a radioactive isotope that emits beta particles and energetic gamma rays. It is widely used in radiation therapy to target and destroy cancer cells.

Based on the analysis, the correct answer is **Cobalt-60 (Co-60)**, which is used in the treatment of cancer through radiation therapy.

### Step-by-Step Solution:
1. **Identify the Purpose**: Understand that the question is asking for a radioisotope used in cancer treatment.

2. **Evaluate Each Option**:
- Sodium-24: Not used for cancer treatment.
- Carbon-14: Not used for cancer treatment.
- Uranium-235: Not used for cancer treatment.
- Cobalt-60: Used for cancer treatment.

3. **Conclusion**: Cobalt-60 is the only isotope from the options that is used in radiation therapy to treat cancer.