ISO 6640:2024

International
Standard
ISO 6640
First edition
Measurement of density of water-
sediment mixture using radiation
transmission method
PROOF/ÉPREUVE
Reference number
ISO 6640:2024(en) © ISO 2024

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ISO 6640:2024(en)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
PROOF/ÉPREUVE
© ISO 2024 – All rights reserved
ii

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ISO 6640:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Protection against ionizing radiation . 2
5 Properties of sediments . 2
5.1 General .2
5.2 Particle size .2
6 Principles of radiation transmission and backscattering methods . 2
6.1 General .2
6.2 Principle of gamma and X-ray transmission method .2
6.3 Principle of gamma ray backscattering method .5
7 Calibration procedure . 6
Annex A (informative) Prototypes of instruments . 7
Annex B (informative) Calibration . 9
Annex C (informative) Case study: Measurement of vertical profile of water-sediment mixture
density.12
Bibliography .
...

ISO/DIS PRF 6640:2023(E2024(en)
ISO/DIS PRF 6640:2023(E)
ISO/TC 113 / /SC 06 / WG 05 6
Secretariat: ASI BIS
Date: 2024-03-15
Measurement of density of water-sediment mixture using radiation
transmission method
First edition
© ISO 20232024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
EmailE-mail: copyright@iso.org
Website: www.iso.orgwww.iso.org
Published in Switzerland
© ISO 2023 – All rights reserved i
© ISO 2024 – All rights reserved

i

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ISO/DIS PRF 6640:2023(E2024(en)
Contents
Foreword . iii
Introduction . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Protection against ionizing radiation . 2
5 Properties of sediments . 2
5.1 General . 2
5.2 Particle size. 2
6 Principles of radiation transmission and backscattering methods . 2
6.1 General . 2
6.2 Principle of gamma and X-ray transmission method . 2
6.3 Principle of gamma ray backscattering method . 6
7 Calibration procedure . 8
Annex A (informative) Prototypes of instruments . 9
Annex B (informative) Calibration . 13
Annex C (informative) Case study: Measurement of vertical profile of water-sediment mixture density . 17
Bibliography . 21

ii © ISO 2023 – All rights reserved
© ISO 2024 – All rights reserved

ii

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ISO/DIS PRF 6640:2023(E2024(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, i
...