Document Details
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Title:
A DIRECT CALIBRATION USING GAMMA SPECTROMETRY FOR MEASURING RADIOACTIVITY IN HUMANS ( HEALTH PHYSICS, 1968, VOL. 14, PP 439-447 )
Author(s):
OLSON, D G [AEC-ATOMIC ENERGY COMMISSION, THE U.S.]
Subject Terms:
HREX
Document Location:
Location - DOE/NNSA NUCLEAR TESTING ARCHIVE Address - P.O. Box 98521 City - Las Vegas State - NV Zip - 89193-8521 Phone - (702)794-5106 Fax - (702)862-4240 Email - NTA@NV.DOE.GOV
Document Type:
JOURNAL ARTICLE
Publication Date:
1967 Jul 23
Declassification Status:
Never classified
Document Pages:
0010
Accession Number:
NV0702709
Originating Research Org.:
HEALTH PHYSICS
OpenNet Entry Date:
1994 Aug 27
OpenNet Modified Date:
2012 May 14
Description/Abstract:
IN THIS PAPER, A PROCEDURE IS DESCRIBED BY WHICH THE QUANTITY OF IN VIVO RADIOACTIVITY CAN BE EVALUATED ENTIRELY FROM THE THEORETICAL CALCULATIONS, ELIMINATING THE NEED FOR OBTAINING RADIOACTIVE STANDARDS NECESSARY IN THE USUAL EMPIRICAL METHODS OF CALIBRATION. THE NUMBER OF GAMMA-RAYS EMITTED FROM A SOURCE THAT ARE TOTALLY ABSORBED IN A KNOWN VOLUME OF CRYSTAL CAN BE CALCULATED. GAMMA-RAYS WHICH ARE PARTIALLY ABSORBED BY THE DETECTOR ARE CORRECTED FOR BY APPLYING THE APPROPRIATE FACTOR FROM A PEAK-TO-TOTAL RATIO PLOT WHICH HAS BEEN PREPARED. ABSORPTION OF THE GAMMA-RAYS IN MUSCLE AND BONE CAN BE PREDICTED BY USING THE MASS ABSORPTION COEFFICIENTS PROVIDED IN THE PAPER. THUS, THE GAMMA-RAYS FOUND IN THE PHOTOPEAK OF THE GAMMA SPECTRUM CAN BE MEASURED AND USED TO DETERMINE THE NUMBER OF GAMMAS EMITTED BY THE SOURCE. THE PROPOSED PROCEDURE GAVE A SMALLER ERROR THAN THE CONVENTIONAL EMPIRICAL METHOD.