Novel studies in x-ray emission analysis using radioisotopes

Thesis/Dissertation · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5630743

Joyce, J R

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
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400101 -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
400103* -- Radiometric & Radiochemical Procedures-- (-1987)
ACTIVATION ANALYSIS
AUTORADIOGRAPHY
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
CHEMICAL ANALYSIS
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTS
EVEN-ODD NUCLEI
GLASS
GOLD 195
GOLD ISOTOPES
HADRON REACTIONS
HEAVY NUCLEI
HYDROGEN ISOTOPES
INTERMEDIATE MASS NUCLEI
IODINE 125
IODINE ISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIGHT NUCLEI
MINUTES LIVING RADIOISOTOPES
NICKEL 63
NICKEL ISOTOPES
NONDESTRUCTIVE ANALYSIS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
ODD-EVEN NUCLEI
PROTON REACTIONS
QUANTITATIVE CHEMICAL ANALYSIS
RADIOCHEMICAL ANALYSIS
RADIOISOTOPES
RESOLUTION
SECONDS LIVING RADIOISOTOPES
SELENIUM 75
SELENIUM ISOTOPES
SPATIAL RESOLUTION
SULFUR 35
SULFUR ISOTOPES
TECHNETIUM 91
TECHNETIUM ISOTOPES
TRACE AMOUNTS
TRITIUM
X-RAY EMISSION ANALYSIS
YEARS LIVING RADIOISOTOPES