Document Details


Title:
DESIGN AND CALIBRATION OF A TOTAL-BODY COUNTING SYSTEM FOR MEASURING RADIOACTIVITY IN BEAGLES ( INTERNATIONAL JOURNAL OF APPLIED RADIATION AND ISOTOPES, VOL. 27, 1976, PP. 103-111 )
Subject Terms:
CALIBRATION; EXCRETION; RADIATION DOSES; SKELETON; SAMPLING; RADIOCHEMICAL ANALYSIS; DOGS; RETENTION; COUNTING TECHNIQUES; RADIUM 226; COBALT 60; RADIUM 225; RADIUM 228; AMERICIUM 241; THORIUM 228; STATISTICS; STRONTIUM 90; RESEARCH PROGRAMS; DATA
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:
1976 Dec 31
Declassification Status:
Never classified
Document Pages:
0010
Accession Number:
NV0067566
OpenNet Entry Date:
1994 Aug 26
OpenNet Modified Date:
2003 Sep 18
Description/Abstract:
A POSITIONER FOR HOLDING DOGS DURING TOTAL-BODY COUNTING WAS DESIGNED. IT WAS CONSTRUCTED SO THAT WHEN AN ANIMAL IS PLACED ON HIS BACK, HIS MIDLINE IS CURVED INTO A 33-CM RADIS ARC, WHICH APPROXIMATES AN ISORES PONSE LINE FOR A 20 X 10 CENTIMETER SODIUM IODIDE THALLIUM CRYSTAL POS ITIONED WITH ITS FACE AT THE CENTER OF CURVATURE FOR THIS ARC. UNLIKE OTHER COUNTING SYSTEMS, THE RESPONSE IS RELATIVELY INDEPENDENT OF THE LOCATION OF AN EMITTER AT VARIOUS POINTS ALONG THE DOG'S MIDLINE WITHI N ABOUT +5%. THE POSITIONER MOLDS THE ANIMAL TO A UNIFORM 15 CENTIMETE R LATERAL THICKNESS SO THAT BODY ATTENUATION OF PHOTONS IS SIMILAR AMO NG ADULT BEAGLES. EFFECTS ON COUNTING RATE OF DIFFERENCES IN POSITION OF DOGS WITHIN ITS CONFINES ARE MINOR, AND IN THE ORDER OF +2%. CALIBR ATION WAS ACCOMPLISHED BY COUNTING IN THIS POSITIONER A NUMBER OF DOGS CONTAINING VARIOUS RADIONUCLIDES. THEIR BODY BURDENS WERE THEN DETERM INED BY THE RADIOACTIVITY OF THEIR INDIVIDUAL BONES AND TISSURES FOLLO WING AUTOPSY OR FROM ANALYSIS OF THEIR TOTAL EXCRETION FROM INJECTION UP TO THE TIME OF COUNTING. THE CALIBRATION FACTOR APPEARED TO DEPEND UPON THE PHOTON ENERGY OF THE EMITTER AT ABOUT 100 KEV AND BELOW, BUT WAS INDEPENDENT OF ENERGY ABOVE ABOUT 200 KEV. THIS CONCEPT CAN BE AD APTED READILY TO THE TOTAL-BODY COUNTING OF OTHER LARGE ANIMALS INCLUD ING HUMANS.


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