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Home | Current Program | PAC 6 | SC 6-4SC 6-4: Fundamental Principles of Dose ReconstructionThe purpose of this report is to establish a scientific foundation for performing dose reconstruction in a wide variety of radiation exposure scenarios. It is expected that the report will be of value in both retrospective and future analyses of accidental and planned exposures of humans to radiation from a wide variety of sources and nuclear incidents. Examples of dose reconstructions that the report will cover include estimates of dose and associated uncertainties for atomic veterans, energy workers, individuals exposed as a result of nuclear reactor accidents, and members of the public exposed to radioactive fallout from nuclear accidents and reactor production and processing of materials for nuclear weapons. The report will build on the results of analysis of uncertainty in estimating external and internal absorbed doses presented in two other NCRP reports being prepared by Scientific Committees 6-1 and 6-3, respectively. It will also address additional uncertainties in determining the variation in radiation sources that can, in turn, affect the estimates of dose to the exposed individuals. The report will also address methods of presenting exposure data and communicating the results of dose reconstructions in a manner that will be clearly understood by the affected individuals. The first meeting of SC 6-4 was held on July 31-August 1, 2006, at NCRP Headquarters, at which there was an orientation to the task, a preliminary discussion of the content of the report, a discussion of existing relevant literature, and the development of a preliminary outline and approach to the task. The second meeting was held on September 7-8, 2006, at NCRP Headquarters, during which there were brief presentations by several members concerning their activities in dose reconstruction, and a more detailed discussion of the scope, outline, content of the report, and the value of including case studies to illustrate key aspects of dose reconstruction. A revised outline was produced and writing assignments were made, with a target date for completion of preliminary draft materials of January 8, 2007. The third meeting was held on January 29-30, 2007 in Las Vegas, Nevada. Some early draft material was available to the SC 6-4 members for review at the meeting. Additions and revisions were made to the outline, additional writing assignments were made, and a schedule for producing a first draft was prepared. Draft materials were due by May 1, 2007 and a consolidated draft by mid-May 2007. The fourth meeting was held on May 22-23, 2007 in Portland, Oregon to review the consolidated draft. Additional draft material was still needed to complete the consolidated draft report. That material was due by July 1, 2007 and an update of the consolidated draft report was distributed for the fifth meeting on July 12-13, 2007 in Portland, Oregon in conjunction with the annual Health Physics Society meeting. The sixth meeting was held November 12-13, 2007 at NCRP Headquarters with an extended discussion of the material prepared to date. Additional assignments were made to complete the remaining sections and to rework several sections to better organize and focus the draft. The seventh meeting was held at NCRP Headquarters on March 3-5, 2008. As a result of an extensive working session during those three days, all sections of the draft report were reviewed and revised. Final writing assignments were made and a schedule prepared for their completion. As of June 30, 2008, the Committee is in the process of assembling a complete draft for PAC 6 review in the third quarter of 2008. As of September 30, 2008, the complete draft is nearing completion, with distribution for PAC 6 review scheduled for October 2008. The membership of SC 6-4 is:
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