Activation Analysis Section: Summary of Activities, July 1967 to June 1968

Technical Report · Sat Mar 01 04:00:00 EST 1969

DOI:https://doi.org/10.2172/4906877· OSTI ID:4906877

LaFleur, Philip D. ^[1]

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1. National Bureau of Standards, Boulder, CO (United States)

The facilities used by the reactor, LINAC and neutron generator groups for activation analysis are described. Proposed installation of four new irradiation terminals and a new pneumatic transfer tube system are outlined. A new 2.5-mA neutron generator has been installed and the biological shield, pneumatic transfer system and the detector assembly modified. Studies of blank problems for oxygen determination and self-absorption corrections in photopeak analysis have resulted in greatly improved precision for Standard Reference Materials. Halide in photographic emulsions, using 14-MeV and 2.6-MeV neutrons, have been determined. Considerable emphasis has been placed on the development of group radiochemical separations, SRM steel and high purity zinc samples have been analyzed using this technique . Eighteen different SRMs were analyzed for a variety of elements and a variety of service analyses were performed. The self-absorption effects of the matrix on irradiation photons were studied and calculations of sensitivities for photon activation analysis were made. Carbon in sulfur, yttrium in rare earth oxides and oxygen in sodium were determined by photon activation. The extraction of metals by bis(2-ethylhexyl) orthophosphoric acid has been studied, and distribution coefficients are given for many of the transition metals. The results indicate enhanced applicability of this reagent for radiochemical separations. Updated keys for computer literature searching and a sample output are included.

• Research Organization: National Bureau of Standards, Boulder, CO (United States)
• Sponsoring Organization: US Atomic Energy Commission (AEC); US Department of Commerce
• NSA Number: NSA-23-035025
• OSTI ID: 4906877
• Report Number(s): NBS-TN--458
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
ACTIVATION ANALYSIS
ALKYL RADICALS
ALLOYS
AMINO ACIDS
ANTIMONY
ARSENIC
ASBESTOS
BLOOD SERUM
BREMSSTRAHLUNG
BROMINE
CARBON
CAST IRON
CHLORINE
CLAYS
COBALT
COPPER
CREATINE
Cockcroft-Walton neutron generator
DEHPA
DETERMINATION
DISTRIBUTION
EMULSIONS
ETHYL RADICALS
GLASS
GOLD
HALIDES
HETEROCYCLICS- - NEUTRON BEAMS
HEXYL RADICALS
IMPURITIES
IRON
IRRADIATION IMPURITIES
MANGANESE
METALS
MINERALS
MOLYBDENUM
N20140* --Chemistry--Analytical & Separations Chemistry
NBS LINAC
NBS reactor
NEUTRON BEAMS
NICKEL
ORGANIC ACIDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
OXIDES
OXYGEN
PHOTOGRAPHY
PLATINUM
POTASSIUM
PURINE
QUARTZ
RARE EARTHS
REFRACTORIES
SCANDIUM
SEPARATION PROCESSES
SILICON
SILVER
SODIUM
SOLDERING
SOLUTIONS
SOLVENT EXTRACTION
STEELS
SULFUR
Standard Reference Materials
TRANSITION METALS
UREA
URIC ACID
URINE
VANADIUM
WATER
YTTRIUM
ZINC
activation analysis
computer literature searching
extraction
group separations
homogeneity testing
hydrogen bis(2-ethylhexyl) phosphate
matrix effect
molybdenum
photon activation analysis sensitivities
zinc