Initially considered as a kind of radiobiological law, the linear no-threshold (LNT) model, which by definition supports absence any threshold for cancer risk induction after irradiation, is nowadays more reasonably described pragmatic and prudent approach International Organizations. However, it remains today dogma in radiological protection. Actually, this model had been essentially developed...

This letter comments on the ongoing re-evaluation of the dose and dose rate effectiveness factor (DDREF) equal to 2.0, currently recommended by the International Commission on Radiological Protection. The topics of DDREF and threshold are related to the linear no-threshold theory (LNT), which does not take into account that DNA damage and repair are in dynamic equilibrium probably reached in a ...

The U.S. Environmental Protection Agency (EPA) bases its risk assessments, regulatory limits, and nonregulatory guidelines for population exposures to low level ionizing radiation on the linear no-threshold (LNT) hypothesis, which assumes that the risk of cancer due to a low dose exposure is proportional to dose, with no threshold. The use of LNT for radiation protection purposes has been repea...

Media reports of deaths and devastation produced by atomic bombs convinced people around the world that all ionizing radiation is harmful. This concentrated attention on fear of miniscule doses of radiation. Soon the linear no threshold (LNT) paradigm was converted into laws. Scientifically valid information about the health benefits from low dose irradiation was ignored. Here are studies which...

Asbestos-related risks have been estimated on the basis of extrapolations from the past, when high-dose occupational exposures were frequent. The linear no-threshold (LNT) dose-response pattern has generally been assumed for the low exposure levels. However, applicability of the LNT hypothesis to low asbestos exposures has never been proven. Asbestos fibers are present in the natural environmen...

The magnitude of the risks from low doses of radiation is one of the central questions in radiological protection. It is particularly relevant when discussing the justification and optimization of diagnostic medical exposures. Medical X-rays can undoubtedly confer substantial benefits in the healthcare of patients, but not without exposing them to effective doses ranging from a few microsievert...

some areas of ramsar, a city in northern iran are among the world’s wellknown inhabited areas with highest levels of natural radiation. annual exposure levels in these areas are up to 260 mgy y‐1 and the mean exposure rate is about 10 mgy y‐1 for a population of about 2000 residents. if elevated levels of natural radiation as high as a few hundred msv per year is detrimental to health and leads...

This is a reflection from a certified health physicist regarding his becoming aware, during his 40-year career, that the linear no-threshold (LNT) model and the associated As Low As Reasonably Achievable concept have no scientific basis and make no positive contribution to radiation safety. They should be replaced by an alternative, scientifically based model that includes a threshold, below wh...