Take an X-ray dental film on the patient radiation dose of about 5 microsieverts, take an X-ray chest film on the patient radiation dose of about 20 microsieverts, mammography on the patient radiation dose of about 3,000 microsieverts, take a chest CT on the patient radiation dose of about 5,800 microsieverts.
Of course, the operator radiation is very low, because the equipment is isolated, hospitals in the construction of the time are used on the lead plate lead wall lead glass for isolation, isolation is very good, the U.S. empire radiation staff to receive radiation dose limit of 50,000 microsieverts a year.