2World Health Organization.WHO handbook on indoor radon:a public health perspective[Z].2009:1-110.
3Wolff S,Afzal V,Jostes RF,et al.Indications of repair of radon-in- duced chromosome damage in human lymphocytes:an adaptive re- sponse induced by low doses of X-rays[J].Environ Health Perspect,1993,101(Suppl 3):73S-77.
4Bilban M,Vaupoti J.Chromosome aberrations study of pupils in high Radon level elementary school[J].Health Phys,2001,80(2):157-163.