Orders of magnitude (radiation)

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Recognized effects of higher acute radiation doses are described in more detail in the article on radiation poisoning. Although the International System of Units (SI) defines the sievert (Sv) as the unit of radiation dose equivalent, chronic radiation levels and standards are still often given in unts of millirems (mrem), where 1 mrem equals 1/1000 of a rem and 1 mrem equals 0.01 mSv. Light radiation sickness begins at about 50–100 rad (0.5–1 gray (Gy), 0.5–1 Sv, 50–100 rem, 50,000–100,000 mrem).

The following table includes some dosages for comparison purposes, using millisieverts (mSv) (one thousandth of a sievert). The concept of radiation hormesis is relevant to this table – radiation hormesis is a hypothesis stating that the effects of a given acute dose may differ from the effects of an equal fractionated dose. Thus 100 mSv is considered twice in the table below – once as received over a 5-year period, and once as an acute dose, received over a short period of time, with differing predicted effects. The table describes doses and their official limits, rather than effects.

Level (mSv) Duration Hourly equivalent (μSv/hour) Description
0.001 Hourly 1 Cosmic ray dose rate on commercial flights varies from 1 to 10 μSv/hour, depending on altitude, position and solar sunspot phase.[1]
0.01 Daily 0.4 Natural background radiation, including radon[2]
0.06 Acute - Chest X-ray (AP+Lat)[3]
0.07 Acute - Transatlantic airplane flight.[2]
0.09 Acute - Dental X-ray (Panoramic)[3]
0.1 Annual 0.011 Average USA dose from consumer products[4]
0.15 Annual 0.017 USA EPA cleanup standard[citation needed]
0.25 Annual 0.028 USA NRC cleanup standard for individual sites/sources[citation needed]
0.27 Annual 0.031 Yearly dose from natural cosmic radiation at sea level (0.5 in Denver due to altitude)[4]
0.28 Annual 0.032 USA yearly dose from natural terrestrial radiation (0.16-0.63 depending on soil composition)[4]
0.46 Acute - Estimated largest off-site dose possible from March 28, 1979 Three Mile Island accident[citation needed]
0.48 Day 20 USA NRC public area exposure limit[citation needed]
0.66 Annual 0.075 Average USA dose from human-made sources[2]
0.7 Acute - Mammogram[3]
1 Annual 0.11 Limit of dose from man-made sources to a member of the public who is not a radiation worker in the USA and Canada[2][5]
1.1 Annual 0.13 1980 average USA radiation worker occupational dose[2]
1.2 Acute - Abdominal X-ray[3]
2 Annual 0.23 USA average medical and natural background [3]

Human internal radiation due to radon, varies with radon levels[4]
2 Acute - Head CT[3]
3 Annual 0.34 USA average dose from all natural sources[2]
3.66 Annual 0.42 USA average from all sources, including medical diagnostic radiation doses[citation needed]
4 Duration of the pregnancy 0.6 Canada CNSC maximum occupational dose to a pregnant woman who is a designated Nuclear Energy Worker.[5]
5 Annual 0.57 USA NRC occupational limit for minors (10% of adult limit)
USA NRC limit for visitors
[6]
5 Pregnancy 0.77 USA NRC occupational limit for pregnant women[citation needed]
6.4 Annual 0.73 High Background Radiation Area (HBRA) of Yangjiang, China[7]
7.6 Annual 0.87 Fountainhead Rock Place, Santa Fe, NM natural[citation needed]
8 Acute - Chest CT[3]
10 Acute - Lower dose level for public calculated from the 1 to 5 rem range for which USA EPA guidelines mandate emergency action when resulting from a nuclear accident[2]

Abdominal CT[3]
14 Acute - 18F FDG PET scan,[8] Whole Body
50 Annual 5.7 USA NRC/ Canada CNSC occupational limit for designated Nuclear Energy Workers[5](10 CFR 20)
100 5 years 2.3 Canada CNSC occupational limit over a 5-year dosimetry period for designated Nuclear Energy Workers[5]
100 Acute - USA EPA acute dose level estimated to increase cancer risk 0.8%[2]
120 30 years 0.46 Exposure, long duration, Ural mountains, lower limit, lower cancer mortality rate[9]
150 Annual 17 USA NRC occupational eye lens exposure limit[citation needed][clarification needed]
175 Annual 20 Guarapari, Brazil natural radiation sources[citation needed]
250 2 hours 125 000 (125 mSv/hour) Whole body dose exclusion zone criteria for US nuclear reactor siting[10] (converted from 25 rem)
250 Acute - USA EPA voluntary maximum dose for emergency non-life-saving work[2]
260 Annual 30 Calculated from 260 mGy per year peak natural background dose in Ramsar[11]
400-900 Annual 46-103 Unshielded in interplanetary space.[12]
500 Annual 57 USA NRC occupational whole skin, limb skin, or single organ exposure limit
500 Acute - Canada CNSC occupational limit for designated Nuclear Energy Workers carrying out urgent and necessary work during an emergency.[5]

Low-level radiation sickness due to short-term exposure[citation needed]
750 Acute - USA EPA voluntary maximum dose for emergency life-saving work[2]
1000 Hourly 1 000 000 (1000 mSv/hour) level reported during Fukushima I nuclear accidents, in immediate vicinity of reactor[13]
3000 Acute - Thyroid dose (due to iodine absorption) exclusion zone criteria for US nuclear reactor siting[10] (converted from 300 rem)
4800 Acute - LD50 (actually LD50/60) in humans from radiation poisoning with medical treatment estimated from 480 to 540 rem.[14]
5000 Acute - Calculated from the estimated 510 rem dose fatally received by Harry Daghlian on 1945 August 21 at Los Alamos and lower estimate for fatality of Russian specialist on 1968 April 5 at Chelyabinsk-70.[15]
5000 5 000 - 10 000 mSv. Most commercial electronics can survive this radiation level.[16]
20 000 Acute 2 114 536 Interplanetary exposure to solar particle event (SPE) of October 1989.[17][18]
21 000 Acute - Calculated from the estimated 2100 rem dose fatally received by Louis Slotin on 1946 May 21 at Los Alamos and lower estimate for fatality of Russian specialist on 1968 April 5 Chelyabinsk-70.[15]
48 500 Acute - Roughly calculated from the estimated 4500 + 350 rad dose for fatality of Russian experimenter on 1997 June 17 at Sarov.[15]
60 000 Acute - Roughly calculated from the estimated 6000 rem doses for several Russian fatalities from 1958 onwards, such as on 1971 May 26 at the Kurchatov Institute. Lower estimate for a Los Alamos fatality in 1958 December 30.[15]
100 000 Acute - Roughly calculated from the estimated 10000 rad dose for fatality at the United Nuclear Fuels Recovery Plant on 1964 July 24.[15]
200 000 170 000 For over 1100 hours (170 mSv) Some Chernobyl emergency workers' doses[13]
1 000 000 000 The most radiation-hardened electronics can survive this radiation level.[19]
Comparison of Radiation Doses - includes the amount detected on the trip from Earth to Mars by the RAD on the MSL (2011 - 2013).[20][21][22][23]

See also

External links

References

  1. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Oak Ridge National Laboratory (http://www.ornl.gov/sci/env_rpt/aser95/tb-a-2.pdf)
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Health Physics Society (http://www.hps.org/documents/meddiagimaging.pdf)
  4. ↑ 4.0 4.1 4.2 4.3 Oak Ridge National Laboratory (http://www.ornl.gov/sci/env_rpt/aser95/appa.htm)
  5. ↑ 5.0 5.1 5.2 5.3 5.4 Radiation Protection Regulations, Canada
  6. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  7. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  9. ↑ [1]
  10. ↑ 10.0 10.1 10 CFR Part 100.11 Section 1
  11. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  12. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  13. ↑ 13.0 13.1 Lua error in package.lua at line 80: module 'strict' not found.
  14. ↑ Biological Effects of Ionizing Radiation
  15. ↑ 15.0 15.1 15.2 15.3 15.4 Lua error in package.lua at line 80: module 'strict' not found.
  16. ↑ ieee.org - Radiation Hardening 101: How To Protect Nuclear Reactor Electronics
  17. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  18. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  19. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  20. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  21. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  22. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  23. ↑ Lua error in package.lua at line 80: module 'strict' not found.
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