LET and biological damage are:

LET and biological damage are:

• A. Indirectly proportional
• B. Unrelated
• C. Directly proportional
• D. Inversely proportional

Answer: (C)

Higher linear energy transfer means energy is deposited more densely along the radiation track, producing more ionizations in a small amount of tissue. That concentrated energy causes more cellular and molecular damage, especially to DNA, so as LET increases, the observed biological effects generally become greater. This is why the relationship is viewed as directly proportional: more LET tends to yield more damage per unit path length. In practice, the exact amount of damage can vary with factors like repair processes and particle type, but the overall trend taught is that higher LET leads to greater biological effect. The idea that damage would rise or fall independently of LET, or that LET and damage are unrelated, doesn’t fit how energy deposition translates into cellular harm.

Higher linear energy transfer means energy is deposited more densely along the radiation track, producing more ionizations in a small amount of tissue. That concentrated energy causes more cellular and molecular damage, especially to DNA, so as LET increases, the observed biological effects generally become greater. This is why the relationship is viewed as directly proportional: more LET tends to yield more damage per unit path length. In practice, the exact amount of damage can vary with factors like repair processes and particle type, but the overall trend taught is that higher LET leads to greater biological effect. The idea that damage would rise or fall independently of LET, or that LET and damage are unrelated, doesn’t fit how energy deposition translates into cellular harm.