Absorbed Dose
When ionizing radiation interacts with any material, energy is deposited in (absorbed by) the material. The amount of radiation energy absorbed by a material is called the absorbed dose with units of rads or grays (Gy). The rad (radiation absorbed dose) and gray are defined as follows:
1 rad = 100 ergs/gram
also
1 gray (Gy) = 100 rads
An exposure of 1 roentgen will deliver a dose of 0.877 rad to the air at STP.
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