Electromagnetic radiation: Different types of electromagnetic radiation have various properties and uses. Gamma rays are highly penetrating and can pass through thick materials, including steel.
Cargo inspection: Inspectors use gamma rays to penetrate steel shipping containers and form images of the contents. Gamma rays can pass through dense materials and reveal hidden objects inside.
Conclusion: The type of electromagnetic radiation used for imaging objects inside large steel shipping containers is gamma rays.
References: Integrated Physical Sciences resources on electromagnetic radiation, uses of gamma rays in industrial applications.
