Table 2-44

Table 2-44. UNSCEAR 1988 estimates of average annual effective dose equivalents from manmade compared to natural sources (from Mettler et al. 1990, Table 3)
Annual effective dose equivalent from natural sources.

Source or practice	Present annual individual doses (mSv)		Collective dose commitments (per year of practice)
Source or practice	Per person (world population)	Typical range (for exposed individuals)	Million man-Sv	Equivalent years of background
ANNUAL
Natural background	2.4	1-5	11	1
Medical exposures (diagnostic)	0.4-1	0.1-10	2-5	0.2-0.5
Occupational exposure	0.002	0.5-5	0.01	0.001
Nuclear power production	0.0002	0.001-0.1	0.001 (0.03)^a	0.0001 (0.004)^a

SINGLE
All test explosions together	0.01	0.01	5 (26)^a	0.5 (2.4)^a
Nuclear accidents			0.6

^a The additional long-term collective dose commitments from Rn and (14)C for nuclear power production and (14)C for test explosions are given in parentheses.