Which of the following is used as protective shields in nuclear industries?

Options

A. `.^(27)AI`
B. `.^(10)B`
C. `.^(16)O`
D. `.^(14)C`

Answer

To solve the question "Which of the following is used as protective shields in nuclear industries?" we need to analyze the options provided: Aluminum-27, Boron-10, Oxygen-16, and Carbon-14.

### Step-by-Step Solution:

1. **Identify the Purpose of Protective Shields in Nuclear Industries:**
- Protective shields in nuclear industries are primarily used to absorb or block radiation, especially neutrons, to protect workers and the environment from harmful radiation exposure.

2. **Examine Each Option:**
- **Aluminum-27:** While aluminum can be used in various applications, it is not particularly effective at absorbing neutrons.
- **Boron-10:** This isotope of boron is known for its ability to absorb neutrons effectively. It has a high affinity for neutrons, making it an excellent choice for radiation shielding.
- **Oxygen-16:** Oxygen does not have significant neutron absorption capabilities and is not used as a protective shield in nuclear applications.
- **Carbon-14:** This isotope is mainly used in radiocarbon dating and does not serve as a protective shield against radiation.

3. **Conclusion:**
- Based on the analysis, Boron-10 is the most suitable option as it has a high capacity to absorb neutrons, making it effective for use as a protective shield in nuclear industries.

### Final Answer:
- **Boron-10** is used as a protective shield in nuclear industries.