Final answer:
The SI unit of exposure which measures radiation in air is the Roentgen (R).
Step-by-step explanation:
The SI unit of exposure which measures radiation in air is the Roentgen (R).
The Roentgen is named after the German physicist Wilhelm Röntgen who discovered X-rays. It is defined as the amount of radiation needed to produce an electrical charge of 2.58 × 10^-4 C in 1 kg of dry air.