Describe how radioactive materials are moved, used and stored in a safe way

5.2.5 Safety Precautions

1️⃣ Moving Radioactive Materials 🚚

• Use sealed containers that are radiation‑tight (like a sturdy lunch box that keeps the smell out).
• Label containers with hazard symbols and QR codes for quick identification.
• Transport on dedicated carts with automatic lock‑down to prevent accidental opening.
• Maintain a record log (digital or paper) that tracks the time, location, and condition of each shipment.

2️⃣ Using Radioactive Materials ⚙️

1. Wear personal protective equipment (PPE) – gloves, lab coat, and eye protection.
2. Work in a fume hood or glove box to contain any airborne particles.
3. Use remote handling tools (robotic arms) when possible, like a robotic chef handling a hot pan.
4. Monitor exposure with dosimeters that give real‑time readings.
5. Follow the ALARA principle (As Low As Reasonably Achievable) – minimise time, maximise distance, use shielding.

3️⃣ Storing Radioactive Materials 🏠

Think of a radioactive material as a high‑value antique that must be kept in a secure vault.

• Shielded storage rooms made of lead or concrete reduce gamma radiation.
• Maintain a controlled environment – temperature, humidity, and ventilation are monitored.
• Use barrier systems (double doors, interlocks) to prevent accidental entry.
• Keep a logbook of inventory, last inspection date, and any incidents.
• Regular radiation surveys ensure the storage area stays below safety limits.

Shielding Example: Thickness Calculation

For a gamma source, the required lead thickness t to reduce intensity by a factor of 1000 is given by:

$$ I = I_0 e^{-\mu t} $$
Solve for t when I/I_0 = 10^{-3}:

$$ t = \frac{\ln(10^3)}{\mu} \approx \frac{6.91}{\mu} $$ where μ is the attenuation coefficient of lead.

Key Takeaways for the Exam

• Always use sealed, labelled containers for transport.
• Apply the ALARA principle and use dosimeters during use.
• Store in shielded, controlled environments with regular surveys.
• Remember the logbook and record‑keeping requirements.