The 'rad' is the correct unit used to report the measurement of
- (A)the rate of decay of radioactive source
- (B)the ability of a beam of gamma ray photons to produce ions in a target
- (C)the energy delivered by radiation to a target.✓ Correct
- (D)the biological effect of radiation
Answer: (C)
Solution
The 'rad' (radiation absorbed dose) is the unit of absorbed dose — the energy deposited by ionising radiation per unit mass of the target (1 rad = 0.01 J/kg = 0.01 Gy). That is exactly 'the energy delivered by radiation to a target' → option C. The biological effect of radiation is measured by the rem/sievert (absorbed dose weighted by a quality/RBE factor), the rate of radioactive decay by the becquerel/curie, and the ionising ability of a beam by the roentgen. So 'rad' is the absorbed-dose unit, option C.
JEE Main · 2006 · 30 Apr 2006 · Offline · Single correct option