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What is Unit of one of radiation absorbed is – and explain in detail?
Units of potency

Roentgen and coulomb per kilograme → Units of exposure. It is the amount to which a person is exposed.
Red and Gray  → Units of absorbed dose. It is the amount which is absorbed per gram of tissue.
Rem and Sievert  → Product of the absorbed dose and the modifying factor. Represent the degree of potention danger to health.