High intensity source of polarized x-rays for fluorescent excitation analysis (FEA)

Conference · Tue Feb 01 04:00:00 EST 1977 · IEEE Trans. Nucl. Sci.; (United States)

OSTI ID:7107811

Kaufman, L ^[1]; Shosa, D; Camp, D C

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1. Univ. of California, San Francisco

FEA is being used in medicine to substitute radiotracers and chemical analysis of stable tracers. Excitation with polarized x-rays reduces tracer working levels: Since they scatter at preferential angles they reduce the number of photons reaching the detector, thus decreasing system dead time and background. The use of a 160 kV 19 mA x-ray tube for FEA of iodine (and neighboring elements) realizes count-rates of 2.5 cts/s/ppM I and background reductions from 11.5 ppM I (when using Am-241 excitation) to 5.7 ppM I. These early results indicate that counting time to realize constant quantitation accuracy can be reduced by 90 percent. Since the use of the x-ray tube results in a 50 percent increase in the cost of the source-excited automated system, the ten-fold reduction in analysis time makes this a practical approach.

• OSTI ID: 7107811
• Conference Information: Journal Name: IEEE Trans. Nucl. Sci.; (United States) Journal Volume: NS-24:1
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400103* -- Radiometric & Radiochemical Procedures-- (-1987)
BACKGROUND RADIATION
CHEMICAL ANALYSIS
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION SPECTROSCOPY
ENERGY-LEVEL TRANSITIONS
EXCITATION
FLUORESCENCE SPECTROSCOPY
HALOGENS
IODINE
IONIZING RADIATIONS
ISOTOPE APPLICATIONS
ISOTOPES
NONDESTRUCTIVE ANALYSIS
NONMETALS
POLARIZATION
RADIATION SOURCES
RADIATIONS
SPECTROSCOPY
STABLE ISOTOPES
TRACER TECHNIQUES
X RADIATION
X-RAY EMISSION ANALYSIS
X-RAY EQUIPMENT
X-RAY FLUORESCENCE ANALYSIS
X-RAY SOURCES