<prompt> About LET; all are false except NOT RELATED TO PHARMACOLOGYLow LET radiations are more lethalIt is the propey of the tissueSame as relative biological effectivenessHigh LET radiations have low oxygen enhancement ratio  <response>: LET linear energy transfer- it is the amount of energy deposited per unit length. Given as Kev micrometre. It is highest for alpha paicle high LET, low for beta paicles and gamma emissions Low LET. It is a propey of the radiation. OER oxygen enhancement ratio is the ratio of quantity of radiation required to kill tumour cells in the absence of oxygen to the quantity of radiation required to kill same amount of tumour cells in the presence of oxygen. OER is low for high LET radiations OER 1 and high for low LET radiationsOER 2-3. 