Document jgpznE4bRgjx2aLq9onq4b8p9

NATIONAL CENTER FOR RADIOLOGICAL HEALTH DEPARTMENT OF HEALTH, EDUCATION, AND WELFARE PUBLIC HEALTH SERVICE REFER TO:NCBH:SIB January 2, 1968 Dr. Robert' A. Kehoe Kettering Laboratory Department of Preventive Medicine and Industrial Health College of Medicine University of Cincinnati Cincinnati, Ohio Dear Doctor Kehoe: The enclosed manuscript, "Estimation of Exposure to Radon Daughter Products by Measurement of the Lead-210 Body Burden, Part I: Model for Systemic Transfer and Bodily Retention of Lead-210" resulted out of our investigations into an analytical model through which body burdens of lead-210 can be used to determine environmental levels of radon and its daughters. Because of your experience in this area, we would appreciate your comments on the manuscript. Reports covering other aspects of this analytical model (a lung clearance model for lead-210 and its daughters, and an overall model combining lung clearance, bodily retention and indirect contribution of lead-210 from inhalation, diet and background) are under preparation. Thank you in advance for any comments you may find appropriate. Sincerely yours. Enclosure Henry L. Fisher Radiation Exposure Intelligence Section Standards and Intelligence Branch