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Title:

CONCRETE ANALYSIS BY NEUTRON-CAPTURE GAMMA RAYS USING CALIFORNIUM 252

Accession Number:

00214203

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309020840

Abstract:

THE FEASIBILITY OF ANALYZING CONCRETE AND CEMENT BY A MEASUREMENT OF THE NEUTRON-CAPTURE OR PROMPT GAMMA RAYS WAS INVESTIGATED; A 100-MICRO-G CALIFORNIUM-252 SOURCE WAS USED TO SUPPLY THE NEUTRONS. A LITHIUM DRIFTED GERMANIUM CRYSTAL DETECTED THE CAPTURE GAMMA RAYS EMITTED. THE CAPTURE GAMMA RAYS FROM CEMENT, SAND, AND 3 COARSE AGGREGATES-QUARTZITE GRAVEL, LIMESTONE, AND DIABASE-WERE STUDIED. CONCRETE BLOCKS MADE FROM THESE MATERIALS WERE THEN TESTED. THE CAPTURE GAMMA RAY RESPONSE OF THE CALCIUM, SILICON, AND IRON IN THE CONCRETE BLOCKS WAS IN ACCORD WITH THE ELEMENTS IDENTIFIED IN THE MIX MATERIALS. THE PRINCIPAL SPECTRAL LINES USED WERE THE 6.42 MEV LINE OF CALCIUM, THE 4.93 MEV LINE OF SILICON, AND THE DOUBLET OF IRON AT ABOUT 7.64 MEV. THE ALUMINUM LINE AT 7.72 MEV WAS OBSERVED IN SOME CASES, BUT AT A LOWER INTENSITY WITH THE LIMITED ELECTRONIC EQUIPMENT AVAILABLE. THIS NUCLEAR SPECTROSCOPIC TECHNIQUE OFFERS A POSSIBLE METHOD OF DETERMINING THE COMPONENTS OF SIZABLE CONCRETE SAMPLES IN A NONDESTRUCTIVE, IN SITU MANNER. IN ADDITION, THE NEUTRON-CAPTURE GAMMA RAY TECHNIQUE MIGHT FIND APPLICATION IN CONTROL OF THE CONCRETE AND CEMENT PROCESSES AND FURNISH NEEDED INFORMATION ON PRODUCTION OPERATIONS AND INVENTORIES.

Supplemental Notes:

Sponsored by Committee on Nuclear Principles and Applications. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

Monograph Accession #:

01410329

Authors:

Duffey, Dick
Wiggins, Peter F
Senftle, Frank E
El Kady, A A

Pagination:

pp 13-24

Publication Date:

1972

Serial:

Highway Research Record

Issue Number: 412
Publisher: Highway Research Board

Conference:

51st Annual Meeting of the Highway Research Board

Location: Washington District of Columbia, United States
Date: 1972-1-17 to 1972-1-21

ISBN:

0309020840

Media Type:

Digital/other

Features:

Figures; References (20) ; Tables

Old TRIS Terms:

Subject Areas:

Highways; Materials

Files:

TRIS, TRB

Created Date:

Apr 17 1973 12:00AM

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