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Table 2 Data extracted from UNSCEAR reports about annual average E (Effective doses) due to natural sources

From: A comparison approach to explain risks related to X-ray imaging for scoliosis, 2012 SOSORT award winner

Activity Annual average E (mSv/yr) Radiation source
Natural background due to external exposure (cosmic rays; terrestrial radionuclides) 0.9 (0.4; 0.5) Cosmic rays, terrestrial radionuclides
Natural background due to internal exposure (inhalation; ingestion) 1.5 (1.2; 0.3) Terrestrial radionuclides
Total natural background, worldwide 2.4 Cosmic rays, terrestrial radionuclides
Natural background due to cosmic rays, world average 0.380 Cosmic rays
Natural background due to cosmic rays, sea level 0.270 Cosmic rays
Natural background due to cosmic rays, 1600 m amsl 0.570 Cosmic rays
Natural background due to cosmic rays, 2200 m amsl 0.820 Cosmic rays
Natural background due to cosmic rays, 3900 m amsl 2.020 Cosmic rays
8 hours of flight (London-New York) 0.030 – 0.045 per flight Cosmic rays
  1. E Effective doses, amsl above mean sea level, yr year.