"Ionizing radiation, health effects and protective measures" World Health Organization World Health Organization World Health Organization Ionizing radiation, health effects and protective measures World Health Organization "Ionizing radiation, health effects and protective measures" "Ionizing radiation, health effects and protective measures" "Ionizing radiation, health effects and protective measures" World Health Organization World Health Organization "Ionizing radiation, health effects and protective measures" World Health Organization "Ionizing radiation, health effects and protective measures"