Radioopaque

• Having a property of absorbing, and therefore being opaque to, X-rays.
• Radiopacity increase with atomic weight.
• Radiopaque materials, such as those containing iodine or barium, are used as contrast medium in radiography.
• Metallic foreign bodies in tissues are also radiopaque and can be detected by radiography.
• Such heavy elements as lead and barium can be used in shielding to protect people from unnecessary exposure to ionizing radiation.