late consequences in hematopoietic adaptation in children.People living in these buildings also experienced infertility. Radon therapy Intentional exposure to water and air containing increased amounts of radon is perceived as therapeutic and "radon spas" can be found in United States, Czechia, Poland, Germany, Austria and other countries. Effects of no radiation Given the uncertain effects of low-level and very-low-level radiation, there is a pressing need for quality research in this area. An expert panel convened at the 2006 Ultra-Low-Level Radiation Effects Summit at Carlsbad, New Mexico, proposed the construction of an Ultra-Low-Level Radiation laboratory. The laboratory, if built, will investigate the effects of almost no radiation on laboratory animals and cell cultures, and it will compare these groups to control groups exposed to natural radiation levels. Precautions would be made, for example, to remove potassium-40 from the food of laboratory animals. The expert panel believes that the Ultra-Low-Level Radiation laboratory is the only experiment that can explore with authority and confidence the effects of low-level radiation; that it can confirm or discard the various radiobiological effects proposed at low radiation levels e.g. LNT, threshold and radiation hormesis. The first preliminary results of the effects of almost no-radiation on cell cultures was reported by two research groups in 2011 and 2012; researchers in the US studied cell cultures protected from radiation in a steel chamber 650 meters underground at the Waste Isolation Pilot Plant in Carlsbad, New Mexico and researchers in Europe proposed an experiment design to study the effects of almost no-radiation on mouse cells (pKZ1 transgenic chromosomal inversion assay), but did not carry out the experiment. See also Background radiation Dose fractionation Hormesis Radithor Linear no-threshold model Petkau effect Radioresistance Ramsar, Mazandaran References Further reading Sanders, Charles L. (2009). Radiation Hormesis and the Linear-No-Threshold Assumption. External links International Dose-Response Society. University of Massachusetts center for research on hormesis. Many papers on radiation hormesis. Health Risks from Exposure to Low Levels of Ionizing Radiation: BEIR VII Phase 2 Radiation Hormesis Overview by T. D. Luckey, who wrote a book on the subject (Luckey, T. D. (1991). Radiation Hormesis. Boca Raton, FL: CRC Press. ) Radiobiology Radiation health effects ru:Гормезис