Ionizing radiation increases chance of cancer, but most people don't know that it also ages the body. My guess is that one CT scan takes several months off of the average life expectancy. Same probably is the case for bone scans.
http://medicalxpress.com/news/2016-01-su...uries.html "Twice as many patients with non-serious injuries, such as fractures or neck strain, are undergoing CT scans in emergency departments at California hospitals, according to a UCSF-led study, which tracked the use of the imaging from 2005 to 2013."
http://medicalxpress.com/news/2016-01-su...uries.html "Twice as many patients with non-serious injuries, such as fractures or neck strain, are undergoing CT scans in emergency departments at California hospitals, according to a UCSF-led study, which tracked the use of the imaging from 2005 to 2013."