Novel studies in x-ray emission analysis using radioisotopes
Two novel techniques employing radioisotopes for x-ray emission were studied: internal x-ray emission analysis and low energy proton activation with counting of radioactive x-ray emitters. An inexpensive, sensitive technique for the analysis of a broad range of elements (Z 16 through 47 were studied) was developed by implanting radioisotopes (/sup 3/H, /sup 35/S, /sup 63/Ni, /sup 75/Se, /sup 91/Tc, /sup 125/I, /sup 195/Au) into a sample. These radioisotopes decay by x-ray or ..beta../sup -/ emission which in turn excites characteristic x-rays from elements in the sample. The application of this technique to trace analysis was demonstrated with a multielement standard sample containing 0.1% of Ag, Ni, Cr, Zn, Co, Rb, Sc, Br, Mo, and As. Limits of detection varied with the radioisotope and its specific activity. Low energy proton radioactivation (3.6-6 MeV) with subsequent nondispersive x-ray counting was evaluated for trace analysis. Thick target yields and interference-free detection limits were measured for 15 isotopes. This technique was applied for the determination of V and Ga in NBS glasses doped at the 500 and 50 ppm level. Elemental mapping was accomplished by autoradiography. Data from a Ga doped Si semiconductor sample irradiated with 5 MeV protons showed a spatial resolution of 50-100 ..mu..m, with an ultimate limit of 3-10 ..mu..m.
- Research Organization:
- Texas A and M Univ., College Station (USA)
- OSTI ID:
- 5630743
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ELEMENTS
X-RAY EMISSION ANALYSIS
GLASS
ACTIVATION ANALYSIS
AUTORADIOGRAPHY
GOLD 195
IODINE 125
NICKEL 63
PROTON REACTIONS
RADIOCHEMICAL ANALYSIS
SELENIUM 75
SPATIAL RESOLUTION
SULFUR 35
TECHNETIUM 91
TRACE AMOUNTS
TRITIUM
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
CHEMICAL ANALYSIS
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
EVEN-ODD NUCLEI
GOLD ISOTOPES
HADRON REACTIONS
HEAVY NUCLEI
HYDROGEN ISOTOPES
INTERMEDIATE MASS NUCLEI
IODINE ISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIGHT NUCLEI
MINUTES LIVING RADIOISOTOPES
NICKEL ISOTOPES
NONDESTRUCTIVE ANALYSIS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
ODD-EVEN NUCLEI
QUANTITATIVE CHEMICAL ANALYSIS
RADIOISOTOPES
RESOLUTION
SECONDS LIVING RADIOISOTOPES
SELENIUM ISOTOPES
SULFUR ISOTOPES
TECHNETIUM ISOTOPES
YEARS LIVING RADIOISOTOPES
400103* - Radiometric & Radiochemical Procedures- (-1987)
400101 - Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures