Common radiation dosage rates

Living within 50 miles of a nuclear power plant|0.09
Airport scanner|0.1
Eating a banana|0.1
Dental X-ray|5
NYC - LA flight|40
Yearly release limit for a nuclear plant|250
Cranial CT-scan (brain scan)|2000
Average yearly dose from national (likely US) sources|3100
Smoking 1.5 packs of cigarettes a day for a year|13000
Max dose permitted for US radiation iron worker|50000
Dose causing symptoms in received in short time|400000
Induces nausea and vomitting in received in short time|1000000
Lethal dose in received in short time|4000000
Source