What is the maximum thickness of material that can be shot using a iridium 192?

What is the maximum thickness of material that can be shot using a iridium 192?

• A. 3.5 inches
• B. 4.0 inches
• C. 2.0 inches
• D. 5.0 inches

Answer: (A)

Understanding how far Ir-192 gamma rays can penetrate a material is key. Ir-192 emits gamma radiation with moderate energy, so it can image through thinner to mid-thickness sections but isn’t as penetrating as higher-energy sources like Co-60. In typical industrial radiography setups for steel, this level of energy allows a reliable radiograph through about 3.5 inches of material; going much thicker would degrade image quality and defect detectability unless exposure is increased or a different source is used. Therefore, 3.5 inches is the practical maximum for Ir-192 in standard practice.

Understanding how far Ir-192 gamma rays can penetrate a material is key. Ir-192 emits gamma radiation with moderate energy, so it can image through thinner to mid-thickness sections but isn’t as penetrating as higher-energy sources like Co-60. In typical industrial radiography setups for steel, this level of energy allows a reliable radiograph through about 3.5 inches of material; going much thicker would degrade image quality and defect detectability unless exposure is increased or a different source is used. Therefore, 3.5 inches is the practical maximum for Ir-192 in standard practice.