Indirect effect describes damage resulting from radiolysis producing free radicals.

Indirect effect describes damage resulting from radiolysis producing free radicals.

• A. It involves direct DNA hit
• B. It results from radiolysis in cytoplasm producing free radicals
• C. It only occurs at high doses
• D. It cannot cause mutations

Answer: (B)

Indirect effect occurs when radiation interacts with water in the cell, causing radiolysis and generating reactive free radicals such as hydroxyl radicals. These radicals diffuse through the cell and attack DNA and other biomolecules, producing damage like strand breaks and base modifications. Because cells are largely water, this radical-driven damage is the main pathway for many radiation effects, especially at common exposure levels. This contrasts with a direct hit, where the radiation directly deposits energy into the DNA itself. It’s not limited to high doses; indirect effects occur across a range of doses and can lead to mutations through radical-induced damage.

Indirect effect occurs when radiation interacts with water in the cell, causing radiolysis and generating reactive free radicals such as hydroxyl radicals. These radicals diffuse through the cell and attack DNA and other biomolecules, producing damage like strand breaks and base modifications. Because cells are largely water, this radical-driven damage is the main pathway for many radiation effects, especially at common exposure levels. This contrasts with a direct hit, where the radiation directly deposits energy into the DNA itself. It’s not limited to high doses; indirect effects occur across a range of doses and can lead to mutations through radical-induced damage.