In cancer treatments such as external beam radiotherapy, clinicians must carefully monitor the radiation dose delivered to a tumor. This radiation dose is defined as the amount of energy in joules (J\text{J}J) absorbed by each kilogram (kg\text{kg}kg) of body tissue.
Which of the following is the correct unit for this absorbed radiation dose?
kg/J\text{kg/J}kg/J
J/kg\text{J/kg}J/kg
J⋅kg\text{J} \cdot \text{kg}J⋅kg
W/kg\text{W/kg}W/kg