state one safety precaution for each of the following: (1) in handling of a radioactive substance. (2) in establishment of nuclear power plant.

Explanation

### Step-by-Step Solution:

1. **Safety Precaution for Handling Radioactive Substances:**
- When handling radioactive substances, it is crucial to minimize exposure to radiation. One effective safety precaution is to always keep the radioactive substance in a **lead-lined container**. Lead is an effective material for shielding against radiation due to its high density, which helps to absorb and block harmful radiation emitted by the substance.

2. **Safety Precaution for Establishment of Nuclear Power Plant:**
- In the establishment of a nuclear power plant, it is essential to ensure that the environment is adequately protected from radiation. A key safety precaution is to **use uranium rods** for the nuclear reaction and ensure that the environment is **shielded**. This means that the areas where the uranium rods are used should have protective barriers to prevent radiation from escaping into the surrounding environment, thereby ensuring the safety of workers and the public.