The damage of the human body due to radiation (X-rays or gamma rays etc) is measured in : A. Rems B. Roentgen C. Curie D. Rads

The correct answer is: A. Rems.

Rems (roentgen equivalent man) is a unit of absorbed dose of ionizing radiation, defined as the absorbed dose in tissue multiplied by the relative biological effectiveness (RBE) of the radiation. The RBE is a dimensionless number that takes into account the different biological effects of different types of radiation.

Roentgen (R) is a unit of exposure to ionizing radiation, defined as the quantity of X- or gamma radiation that produces 2.58 × 10−4 coulombs of charge per kilogram of air.

Curie (Ci) is a unit of activity of a radioactive substance, defined as the quantity of a radionuclide that decays at a rate of 3.7 × 1010 disintegrations per second.

Rad (radiation absorbed dose) is a unit of absorbed dose of ionizing radiation, defined as the energy absorbed per unit mass of matter.

The damage of the human body due to radiation is measured in rems, which take into account the different biological effects of different types of radiation.