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This report of the National Council on Radiation Protection and Measurements (NCRP) , successor to the National Committee on Radiation Protection and hleasurements, is concerned with the spccification of sealed sources of nuclides which emit gamma rays-sources useful in brachytherapy. The report resulted from the Council's belief that a single well-defined method for specifying the radionuclide in an encapsulated source would be advantageous for both the users and the suppliers of such sources | NCRP REPORT No. 41 SPECIFICATION OF GAMMA-RAY BRACHYTHERAPY SOURCES Recommendations of the NATIONAL COUNCIL ON RADIATION PROTECTION AND MEASUREMENTS Issued April 1 1974 First Reprinting May 1 1985 National Council on Radiation Protection and Measurements 7910 WOODMONT AVENUE Bethesda Md 20814 Copyright National Council on Radiation Protection and Measurements 1974 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 for brief quotation in critical articles or reviews. Library of Congress Catalog Card Number 73-94306 International Standard Book Number 0-913392-23-5 Preface This report of the National Council on Radiation Protection and Measurements NCRP successor to the National Committee on Radiation Protection and Measurements is concerned with the specification of sealed sources of nuclides which emit gamma rays sources useful in brachytherapy. The report resulted from the Council s belief that a single well-defined method for specifying the radionuclide in an encapsulated source would be advantageous for both the users and the suppliers of such sources. Presently encapsulated radionuclides are being specified in terms of the activity of the radionuclide in terms of the equivalent mass of radium or in terms of the exposure rate at a specified distance from the source. This report examines each of these methods of specification and on the basis of this examination develops recommendations on the method of specification considered to be appropriate. Although the subject matter presented in this report is related to that found in NCRP Report No. 40 Protection Against Radiation From Brachytherapy Sources this report s content is limited to the characteristics of the sources themselves rather than to a discussion of the way in which they may .
