Reference · Secure facilities & shielding
Radiation shielding
Radiation shielding (ionizing radiation)
Radiation shielding uses dense materials — commonly lead or concrete — to attenuate ionizing radiation such as X-rays and gamma rays. The required thickness is derived from the source and the material's half-value layer to bring exposure below regulatory limits.
What it is
A barrier engineered to reduce ionizing-radiation exposure on the far side to an acceptable level. Design accounts for the radiation type and energy, workload, occupancy, and distance, and specifies material and thickness accordingly.
Why it exists
Ionizing radiation is a health hazard, so medical, dental, and industrial facilities that use it must shield adjacent occupied areas to meet dose limits set by regulators.
Who it applies to
Contractors building X-ray, CT, radiation-therapy, and industrial-radiography rooms — and the physicists who specify the shielding a facility's license requires.
Frequently asked
What material is used for radiation shielding?
Dense materials are used because they attenuate ionizing radiation efficiently — most commonly lead for X-ray and gamma shielding, and concrete for larger structural barriers. The required thickness is calculated from the source and the material's half-value layer.
Related terms
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