<prompt> What is latent period in radiation biology?Time gap between exposure and development of symptomsTime gap between taking a radiograph and development of an imageThe first and the last dose in radiation therapyTime gap between radiation exposure and radiation induced effects  <response>: Latent PeriodAfter the prodromal reaction comes a latent period, during which the exposed person shows no signs or symptoms of radiation sickness. The extent of the latent period is also dose related, lasting hours or days after supralethal exposures approximately 5 Gy to a few weeks after exposures of about 2 Gy. Oral radiology ; White and Pharaoh 7th edition page no 24 