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ALPHA-EMITTING PARTICLES IN LUNGS

In recognition of the fact that the potential for release of particulate plutonium and transplutonium alpha-emitting elements from nuclear power generation facilities poses questions concerning spatial distribution of dose and the resultant biological effects, the NCRP initiated a new NCRP activity concerned with alpha-emitting particles in lungs. It was not intended that a complete review of the subject would be prepared. On the other hand, the study was not to be directed exclusively to recently promulgated controversial proposals relating to standards for alpha-emitting, particles in the lung. | NCRP REPORT No. 46 ALPHA-EMITTING PARTICLES IN LUNGS Recommendations of the NATIONAL COUNCIL ON RADIATION PROTECTION AND MEASUREMENTS Issued August 15 1975 National Council on Radiation Protection and Measurements 7910 WOODMONT AVENUE WASHINGTON D.c. 20014 Copyright National Council on Radiation Protection and Measurements 1975 All rights reserved. This publication is protected by copyright. No part of this publication may be reproduced in any form or by any means including photocopying or utilized by any information storage and retrieval system without written permission from the copyright owner except brief quotation in critical articles or reviews. Library of Congress Catalog Card Number 75-17147 International Standard Book Number 0-913392-28-6 Preface In recognition of the fact that the potential for release of particulate plutonium and transplutonium alpha-emitting elements from nuclear power generation facilities poses questions concerning spatial distribution of dose and the resultant biological effects the NCRP initiated a new NCRP activity concerned with alpha-emitting particles in lungs. It was not intended that a complete review of the subject would be prepared. On the other hand the study was not to be directed exclusively to recently promulgated controversial proposals relating to standards for alpha-emitting particles in the lung. Rather the new effort was intended to be a limited-scope study aimed at the development of a statement on the question of whether the current practice of averaging over the lungs the absorbed dose from particulate alpha-emitting radionuclides is a defensible procedure in the practice of radiation protection and whether exposure limits derived on this basis are more or less conservative than those that might result from a precise consideration of the spatial distribution of the dose. The present report was prepared by the Ad Hoc Committee on Hot Particles . Serving on the Committee during the preparation of this report were .