A SUMMARY OF DATA THAT WAS USED IN THE REVISION OF THE INTERNAL DOSE RECOMMENDATIONS OF THE INTERNATIONAL COMMISSION ON RADIOLOGICAL PROTECTION
The report of the Internal Dose Committee of the International Commission on Radiological Protection has been reviewed and released for publication. The basic principles and fundamental philosophy of radiation protection are unchanged in this new publication, 'but a number of revisions are made. The most important of these is the reduction of maximum permissible concentration, SPC, of radionuclides in air, water, and food so that the average RBE dose rate to the total body of the occupational worker will be one-third of that formerly permitted. This reduction is intended to reduce the probability of chronic damage, e.g., leukemia and premature aging. The MPC values for bone- seeking radionuclides continue to be based on an accumulation in the bone that is estimated to deliver a RBE dose rate equal to that received from 0.1 mu g of Ra/ sup 226/ and its daughter products. These values were reduced by 32% because recent data indicate that only 30% (rather than 55%) of the daughter products of Ra/sup 226/ is retained in the body. The new MPC values correspond to a RBE dose rats of 0.58 rem per wcek to the bone, 0.8 rem per week to the thyroid or skin, 0.1 rem per week to the total body or gonads. and 0.3 rem per weak to all other organs of the body. A major objective in the revision of the ICRP Handbook has been to obtain reliable values for the distribution of radioelements in the human body following many years of exposure. One of the best sources of such data is the normal distrihution of stable isotopes of these elements in the human body. For the pest six years a study of human tissue has been conducted by the Oak Ridge National Laboratory in cooperation with The University of Tennsssee. This study includes a spectrographic analysis for 37 elements in 35 body organs, from over 300 autopsies that were supplied from 15 countries. For elements such as Ca, Fe, Zn, Cu, Mn, etc., which are known to have a role in the body economy, the geographical variation is not large ---reflecting the state of nutrition of the population. For other elements such as Sr, Cd, Pb, Al, and Cr which many compete with necessary elements in their normal roles, the geographical variation is striking. Some elements such as Cu and Zn in liver, Al in lung, and Cd in kidney, show marked variation with age of subject. Such data are useful not only in calculating the MPC values for the standard man but may serve also as a guide in making refinements to the MPC values when applying them to individuals of a given age, weight, eating habits, etc. MPC values are . given for 88 radionuclides in the 1955 ICRP Handbook and for 227 radionuclides in the 1958 edition. Also, MPC values are given for insoluble as well as soluble radioactive materials and for several critical body ogans resulting in a seven-fold increase in the number of MPC - values. In a few cases (where sufficient data are available) the MPC values are based on a power function rather than an exponential function of the time of exposure. (auth)
- Research Organization:
- Oak Ridge National Lab., Tenn.; Tennessee. Univ., Knoxville
- NSA Number:
- NSA-12-014525
- OSTI ID:
- 4310321
- Report Number(s):
- A/CONF.15/P/757
- Resource Relation:
- Other Information: Prepared for the Second U.N. International Conference on the Peaceful Uses of Atomic Energy, 1958. Orig. Receipt Date: 31-DEC-58
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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