Analysis of coal by neutron activation
Thesis/Dissertation
·
OSTI ID:6050545
The development of a thermal-neutron activation analysis procedure for determining elemental concentrations in whole coal samples, and the goal of combining this technique with other nuclear methods for determining a total mass balance in these and similar complex materials, is described. Problems of applying a fast-neutron activation analysis method for nitrogen are discussed, as well as an efficient procedure for drying and packaging coal samples. A thermal-neutron activation analysis (TNAA) procedure was developed for determining up to 27 elements in coal samples from the US, China, Nigeria, and Brazil. The comparator form of TNAA was applied, using a unique multielement standard, which contained 48 elements. The difference in net photopeak counts between sample and standard, due to ..gamma..-ray attenuation, was reduced by preparing this standard in an organic matrix, which simulates the composition and physical structure of the coal material. The simultaneous irradiation of several aliquots of this standard enabled high precision and accuracy to be attained. An accurate value for oxygen, determined by fast-neutron activation analysis, is used to correct for this effect in the nitrogen determination method.
- Research Organization:
- California Univ., Irvine (USA)
- OSTI ID:
- 6050545
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400101 -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
ACTIVATION ANALYSIS
BARYON REACTIONS
BARYONS
CARBONACEOUS MATERIALS
CHEMICAL ANALYSIS
COAL
ELEMENTARY PARTICLES
ELEMENTS
ENERGY SOURCES
FAST NEUTRONS
FERMIONS
FOSSIL FUELS
FUELS
HADRON REACTIONS
HADRONS
MATERIALS
NEUTRON REACTIONS
NEUTRONS
NITROGEN
NONMETALS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEONS
OXYGEN
THERMAL NEUTRONS
010600* -- Coal
Lignite
& Peat-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400101 -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
ACTIVATION ANALYSIS
BARYON REACTIONS
BARYONS
CARBONACEOUS MATERIALS
CHEMICAL ANALYSIS
COAL
ELEMENTARY PARTICLES
ELEMENTS
ENERGY SOURCES
FAST NEUTRONS
FERMIONS
FOSSIL FUELS
FUELS
HADRON REACTIONS
HADRONS
MATERIALS
NEUTRON REACTIONS
NEUTRONS
NITROGEN
NONMETALS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEONS
OXYGEN
THERMAL NEUTRONS