Radiation from Airplane flight vs. Dental X-ray

Do you know that the radiation a person gets from an airplane flight from NY to LA is 5 times more than a single dental X-ray?  How about the radiation that a patient receives from a Chest X-ray for screening lung cancer?  It is about 100 microSieverts, 1/60 of a whole body PET scan that is used to monitor cancer progress in patients.  A Chest X-ray or a low dosage CT scan can catch lung cancer at its early stage.  If you are at risk (family history, environment exposure, stress, smoking), it is worthwhile to get screened. 

Gwohann has received four PET scans and one CT scan this year for diagnosis and monitoring his cancer.   

Source: http://www.conciergeradiologist.com/pet-scan-radiation.html