Supplemental Table 1.Collected information by data source

Methods / Items
Questionnaire
Demographics / name, age, gender, workplace address, marital status, education, smoking, drinking, exercise, height, weight (by perioda)
Work history & practices / job title, years since began work, total duration of work, working hours per weeka, workplace by perioda, wearing of dosimeter (by perioda), status of shield wall, protective equipment (by work typea)
Radiation procedures / frequency of X-ray, mammography, CT, fluoroscopy, interventional radiography, diagnostic radioisotope, external radiation therapy, dental radiography, brachytherapy, ultrasound diathermy (by perioda)
Experience of high radiation exposure / exposure to >5mSv a quarter, below normal WBC count, radiation work in other joba
Personal medical examination / X-ray (by sitea), mammography, CT (by sitea), fluoroscopy (by sitea), dental radiography, interventional radiography, MRIa
Medical history / cancer and other chronic diseases
Family historya / cancer and thyroid diseases
Sleep pattern / sleeping hours, duration of shift work, sleep quality scorea
Risk perceptiona / risk perception items for radiation
Reproductive & gynecological historya / infertility, stillbirth, miscarriage, birth defect, age of menarche and menopause, use of oral contraceptives

Supplemental Table1.(Continued)

Methods / Items
Buccal cella / buccal cell sample
Radiation dose registry / personal identification number, date of birth, license code, workplace address, quarterly dose data, beginning and end of period of measurement
Cancer registry / personal identification number, ICD-10 code, ICD-O-3 code, first date of diagnosis, cancer diagnosis method, date of death, stage
National health insurance claims data / personal identification number, gender, code of diseasediagnosis, type of medical care, start date of treatment
National health examination / personal identification number, history of disease (stroke, heart disease, hypertension, diabetes mellitus), lifestyle behaviors (smoking, drinking, exercise), height, weight, urinalysis, blood test (hemoglobin, total cholesterol, triglyceride, AST, ALT, r-GTP, creatinine), dental examination, cancer (stomach, breast, colon, liver, cervix) screening results

aNationally sampled subjects only

Supplemental Table 2.Annual collective effective dose and average annual effective dose by diagnostic radiation proceduresamong enrolled radiologic technologists, 1996-2011

Procedures / Noa / Annual collective effective dose (man.mSv) / Average annual effective dose (mSv)
Routine diagnostic X-ray / 9,575 / 8,773.2 / 0.92
CT / 4,512 / 4,662.1 / 1.03
Mammography / 2,310 / 1,298.0 / 0.56
Portable X-ray / 3,215 / 3,198.4 / 0.99
C-arm / 2,033 / 2,071.9 / 1.02
Fluoroscopy / 3,028 / 3,176.2 / 1.05
Interventional radiography / 701 / 784.1 / 1.12
Panoramic radiography / 673 / 683.1 / 1.01
Cephalometric radiography / 2,621 / 2,909.5 / 1.11

aNumber of radiologic technologists that have conducted the procedure

1