Radiation Ultraviolet . basal cell carcinoma, squamous cell carcinoma nizing .Atomic bomb, nuclear accidents, diagnostic and therapeutic procedures and professional exposures .Additive effect with smoking Radon .Lung cancer more than additive effect with smokingRadiation Ultraviolet •basal cell carcinoma, squamous cell carcinoma Ionizing •Atomic bomb, nuclear accidents, diagnostic and therapeutic procedures and professional exposures •Additive effect with smoking Radon •Lung cancer •More than additive effect with smoking