However, none of the six groupings - which included acute lymphoblastic leukaemia, brain tumours and Hodgkin's disease - showed an increasing trend between levels of radiation and rate of disease.

BBC: Radon cancer fears dismissed

Breast cancer screening is in fact based on a radiation benefit ratio, not cost, but suppose that anaysis were to show that the screening should be different for black women, either earlier because of age as above, or avoided completely because of the lower rate of disease and higher radiation sensitivity in youger women making it more likely to kill than cure.

BBC: Race bias in cancer 'costing lives'

Their cells are at a dividing faster rate, so the impact of radiation can be much larger.

CNN: WHO: Cell phone use can increase possible cancer risk

The Australian research focused on the thermal effects or specific absorption rate (SAR) of radio frequency radiation - a measure of its actual effects on brain tissue, whereas the earlier study simply looked at electromagnetic radiation levels.

BBC: Hands-free mobiles given safety boost

Dr. ANDREW EINSTEIN (Cardiologist, Columbia University): Using beta-blockers or other medications to lower patient's heart rate, which in many cases will chip the radiation dose down by minimizing the number of images which are taken, and matching the technical parameters such that the patient doesn't receive too many x-rays.

NPR: Study: Heart CT Scans May Pose Risk

The result is a material that is not only waterproof but is able to block out UV radiation from the sun to such an extent that it would rate a Ultraviolet Protection Factor (UPF) of 101.15 if the chart went that high.

FORBES: Chinese Researchers Develop Waterproof Cotton

Nearly three years into the research, the rate of strokes and death was more than three times higher among participants who had received surgery, radiation or other invasive treatment than among patients given medication for headaches and other symptoms.

NPR: Govt Stops Study Seeking To Prevent Type Of Stroke