LONDON (BBC): There has been a quick increase in the number of persons with CT scans in the UK, according to There has been a sharp rise in the number of people having CT scans in the UK, according to experts assessing the risks of radiation on health. The number of scans on children - who are most at risk - doubled over the past decade to 100,000 a year in 2012. Concerns centre around evidence radiation can increase the chance of developing cancer. But the government-appointed Comare group said the benefits of scans usually outweigh the harms.