<prompt> LD 50 30 is the radiation required toKill 50 of the animals in 30 daysKill 30 of the ani? .5s in 50 daysKill 50 of the animals in 50 daysKill 30 of the animals in 30 days  <response>: Ans a Kill 50 of the ...30days Ref park 20th edThe median lethal dose, LD50 abbreviation for Lethal Dose, 50, LC50 Lethal Concentration, 50 or LCt.50 Lethal Concentration Time of a toxic substance or radiation is the dose required to kill half the members of a tested population. LD50 figures are frequently used as a general indicator of a substances acute toxicity.The related quantities LD5030 or an LD5060 are used to refer to a dose that without treatment will be lethal to 50 of the population wiihin respectively 30 or 60 days. These measures are used more commonly withinRadiation Health Physics, as survival beyond 60 days usually results in recovery. 