Recommended Exposure Limits*, Table

Recommended Exposure Limits*, Table

type of exposure maximum permissible

Occupational exposures (annual)**
Effective dose-equivalent limit
(stochastic effects) 50 mSv
Dose-equivalent limits for tissues
and organs (non-stochastic effects)
Lens of eye 150 mSv
All others (e.g., red bone
marrow, breast, lung, gonads,
skin, and extremities) 500 mSv
Guidance: cumulative exposure 10 mSv times age
Planned special occupational exposure,
effective dose-equivalent limit*** 100 mSv
Guidance for emergency occupational exposure ****
Public exposures (annual)
Effective dose-equivalent limit,
continuous or frequent exposure** 1 mSv
Effective dose-equivalent limit,
infrequent exposure** 5 mSv
Remedial action recommended when:
Effective-dose equivalent greater than 5 mSv
Exposure to radon and its
decay products greater than 0.007 Jhm^-3 *****
Dose-equivalent limit for lens of
eye, skin, and extremities
Education and training exposures (annual)**
Effective dose-equivalent limit 1 mSv
Dose-equivalent limit for lens of
eye, skin, and extremities 50 mSv
Embryo-fetus exposures**
Total dose-equivalent limit 5 mSv
Dose-equivalent limit in a month 0.01 mSv
Negligible individual risk level (annual)**
Effective dose equivalent per source of
practice 0.5 mSv

*Including background but excluding internal exposures. **Sum of
external and internal exposures, excluding medical exposures. ***Effective
dose equivalent in any one planned event or cumulative effective dose
equivalent in planned special exposures over a working lifetime should
not exceed 100 mSv (10 rem). ****Acute exposures in excess of 100 mSv
(10 rem) are justified only by life-saving actions in emergency situations.
*****Joule hours per cubic metre. ^ indicates exponentiation.
Source: National Council on Radiation Protection and Measurements,
Ionizing Radiation Exposure of the Population of the United States (1987).

* * *

Universalium. 2010.

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