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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 10 of 271 (0.043 seconds)Spelling suggestions: "subject:"tracers"" "subject:"racers""
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Water tracing with soluble metal chelates and neutron activation analysis : a laboratory and field studyHanson, Peter James 20 October 1969 (has links)
Research on the application of soluble, metal chelates for
water tracing using thermal neutron activation analysis for tracer
determination has led to the development of several tracers with
promising solution stabilities (conservative behavior) and determination sensitivities. The solution stabilities of the ethylenediamine
tetraacetic acid (EDTA) and the diethylenetriamine pentaacetic acid
(DTPA) chelates of the activable elements Cr, Co, Eu, In, Sb, Sc
and Tb were evaluated in a series of laboratory, radiotracer experiments
conducted under simulated field conditions. They showed that
1) chelation of metals produces highly conservative solution behavior,
2) DTPA is generally better than EDTA for improving tracer behavior,
3) non-chelated metals are rapidly sorbed onto sediments and
4) chelation reduces sorption of metals onto sediments.
Field tests of EuDTPA, TbDTPA, InDTPA and Rhodamine B
fluorescent dye in a small eastern Washington stream demonstrated
that the metal chelates have significantly improved solution stabilities
in natural water compared to widely used Rhodamine B. Minimum
detection levels in natural waters for the activable tracers were determined
to be 0.075 ppb for Eu, 0.10 ppb for Tb and 0.55 ppb for In
in comparison to 0.49 ppb for Rhodamine B. Associated determination
uncertainties (one standard deviation) amount to ±12% for Eu at
12 ppb, ±12% for Tb at 13 ppb, and ±13% for In at 10 ppb compared
to ±7.3% for Rhodamine B at 1-10 ppb. Activation procedures are
feasible which decrease the minimum detection levels to 0.0015 ppb
for Eu, 0.0019 ppb for Tb and 0.0057 ppb for In in comparison to
0.075 ppb for Rhodamine B.
Anion-exchange proved uniquely suited for recovery and concentration
of metal-chelate tracers from natural water and as a low
background irradiation and counting matrix. A method evaluation
and economic analysis clarify the potential application of activable
metal chelates for water tracing. / Graduation date: 1970
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| 2 |
Cannabinoid receptor subtype-1 (CB1) ligands : synthesis and brain PET imaging with 11C and 18F radiotracersAltomonte, Stefano January 2014 (has links)
No description available.
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| 3 |
Determination and application of ³²p specific activity in Columbia River fishRomberg, Gerald Patrick 31 July 1969 (has links)
Graduation date: 1970
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| 4 |
New methods for simple and selective tritium labelling of drug candidates & synthetic studies towards crisamicin A /Sognstrup Larsen, Uffe. January 2005 (has links)
Ph.D.
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| 5 |
Radiochromic dye dosimetry of neutron and gamma fieldsWankerl, Max Wilhelm, 1939- January 1969 (has links)
No description available.
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| 6 |
A method of measuring the diffusion coefficient in metals for penetration depths less than ten micronsStyris, David Lee, 1932- January 1962 (has links)
No description available.
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| 7 |
Preparation of H[superscript]18F, K[superscript]18F and KB[superscript]18FF[subscript]3 from reactor-produced [superscript]18F-Flouride for the synthesis of radioactive [superscript]18F labeled aromatStrouphauer, Allen David 08 1900 (has links)
No description available.
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| 8 |
Tracer studies in cleavage of allyl-1-C¹⁴ - trimethylammonium chloride, allyl chloride-1-C¹⁴, allyl alcohol-1-C¹⁴ and and p-tolyl allyl-1-C¹⁴ sulfide with metalsChandra, Suresh 05 1900 (has links)
No description available.
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| 9 |
Field tracer measurement of aeration performanceNeal, Lawrence Alan 05 1900 (has links)
No description available.
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| 10 |
Kinetic and oxygen-18 tracer studies of methylsulphuric acid : and related compounds.Batts, Barry David. Unknown Date (has links)
No description available.
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