Question

What is a rem, and what is the normal annual dosage for a person, and what is the LD50? 

Answer 1

REM (Roentgen identical man)

One of the two standard units used to gauge the dosage proportionate (or viable measurements), which joins the measure of energy (from an ionizing radiation that is kept in human tissue), alongside the medicinal impacts of the given kind of radiation. For beta and gamma radiation, the measurements identical is the same as the absorbed dose. By difference, the measurements proportional is bigger than the consumed dosage for alpha and neutron radiation, on the grounds that these sorts of radiation are all the more harming to the human body. Subsequently, the measurement proportionate (in rems) is equivalent to the retained dosage (in rads) multiplied by the quality element of the kind of radiation.

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Overall, Americans get a radiation dosage of around 0.62 rem (620 millirem) every year. Half of this dosage originates from common natural radiation. The majority of this background exposure originates from radon in air, with littler sums from cosmic beams and the Earth itself.The other half (0.31 rem or 310 mrem) originates from man-made wellsprings of radiation, including therapeutic, business, and industrial sources. All in all, a yearly dosage of 620 millirem from all radiation sources has not been appeared to cause humans any harm.

Lethal dose (LD50) is the measure of an ingested substance that kills 50 percent of a test. It is communicated in mg/kg, or milligrams of substance per kilogram of body weight. Basic name. Toxin. Lethal doses.