alpha-emitting particles in lungs recommendations of the national council on radiation protection and measurements (ncrp report ; no. 46)文档.pdf

NCRP REPORT No. 46 ALPHA-EMITTING PARTICLES IN LUNGS Recommendations of the NATIONAL COLlNClL ON RADIATION PROTECTION AND MEASUREMENTS Issued August 16,1976 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 photo- copying, or utilized by any information storage and retrieval system without wrltten permission from the copyright owner, except brief quotation in critical articles or reviews. Library ol Congress Catalog Card Number 7.5-17147 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 distribu- tion 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 pre- pared. 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 in- tended to be a limited-scope study aimed a t the development of a state- ment on the question of whether the current practice of averaging over the lungs the absorbed dose from particulate alpha-emitting radionu- clides is a defensible procedure in the practice of radiation