Tissue effects that occur after a threshold dose are referred to as

Tissue effects that occur after a threshold dose are referred to as

• A. Stochastic effects
• B. Tissue Reactions
• C. RBE
• D. LET

Answer: (B)

Tissue reactions are deterministic effects that require a minimum dose to appear. Once you exceed the threshold, the effect occurs and its severity grows as the dose increases. That’s why the term tissue reactions fits: it describes effects like skin reddening, epilation, or cataracts that only occur after a threshold dose and become more pronounced with higher doses. In contrast, stochastic effects have no fixed threshold; their probability increases with dose, but the severity isn’t tied to a specific dose in the same dose‑dependent way. RBE and LET describe radiation quality and how biological impact scales with different radiations, not the type of tissue effect itself.

Tissue reactions are deterministic effects that require a minimum dose to appear. Once you exceed the threshold, the effect occurs and its severity grows as the dose increases. That’s why the term tissue reactions fits: it describes effects like skin reddening, epilation, or cataracts that only occur after a threshold dose and become more pronounced with higher doses.

In contrast, stochastic effects have no fixed threshold; their probability increases with dose, but the severity isn’t tied to a specific dose in the same dose‑dependent way. RBE and LET describe radiation quality and how biological impact scales with different radiations, not the type of tissue effect itself.