By Charles B. Meinhold
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Extra resources for Limitation of Exposure to Ionizing Radiation: Recommendations of the National Council on Radiation Protection and Measurements : Issued March 31, 199 (N C R P Report)
For this reason, the committed equivalent dose and the committed effective dose from the life-long intake of radionuclides of very long effective half-life will overestimate by a factor of approximately two, or more (NCRP, 1987), the lifetime equivalent dose or effective dose. These quantities, therefore, are not particularly useful for estimating health effects or assessing probability of causation. However, the committed equivalent dose and the committed effective dose are appropriate for all routine radiationprotection purposes and should be used, for example, for assessing compliance with the annual effective dose limits and for planning and design.
60 'The significant figures given in this Table are not given to imply a given degree of accuracy. Rather, they are carried forward to establish the tissue weighting factor (w). 8. 6 x 10" (see Section 7). In addition, if a death attributable to cancer occurs, it will result in a mean loss of approximately 15 y of life [see ICRP (1991a) and NCRP (1993a)l. This loss reflects the fact that more radiation-induced cancers, regardless of age at exposure, occur late in life. In contrast, accidental deaths at work may occur at any time in the working lifetime, resulting, on the average, in a greater number of years of life lost [see ICRP (1985) and NSC (1992)l.
The advice given in NCRP Report No. " The 50 mSv annual limit should be utilized only to provide the flexibility required for existing facilities and practices. The NCRP recommends that all new facilities and the introduction of all new practices should be designed to limit annual exposures to individuals to a fraction of the 10 mSv per y limit implied by the cumulative dose limit. Close attention to reducing exposures to ALARA is an integral part of ensuring that occupationally exposed workers enjoy the same level of protection as those in safe industry.
Limitation of Exposure to Ionizing Radiation: Recommendations of the National Council on Radiation Protection and Measurements : Issued March 31, 199 (N C R P Report) by Charles B. Meinhold