Medium-resolution autonomous in situ gamma detection system for marine and coastal waters
| Autor: | O. D. Mullen, B. E. Johnson, David E. Meier, Joseph D. Davidson, Peter H. Santschi, M. Myjak, M. Douglas, Raymond S. Addleman, M. E. Jones, Jon M. Schwantes, Mitchell L. Woodring |
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| Rok vydání: | 2009 |
| Předmět: |
Suspended solids
Buoy Health Toxicology and Mutagenesis Detector Public Health Environmental and Occupational Health Gamma ray Mineralogy Filter (signal processing) Pollution Signal Analytical Chemistry law.invention Nuclear Energy and Engineering Nuclear detection law Environmental science Radiology Nuclear Medicine and imaging Spectroscopy Filtration |
| Zdroj: | Journal of Radioanalytical and Nuclear Chemistry. 282:889-895 |
| ISSN: | 1588-2780 0236-5731 |
| DOI: | 10.1007/s10967-009-0325-y |
| Popis: | We are developing a medium-resolution autono- mous in situ gamma detection system for marine and coastal waters. The system is designed to extract and preconcentrate isotopes of interest from natural waters prior to detection in order to eliminate signal attenuation of the gamma rays traveling through water and lower the overall background from the presence of naturally occurring radioactive iso- topes ( 40 K and U-Th series radionuclides). Filtration is used to preconcentrate target isotopes residing on suspended particles, while chemosorption is employed to preferentially extract truly dissolved components from the water column. Used filter and chemosorbent media will be counted autonomously using two LaBr3 detectors in a near 4-p configuration around the samples. A compact digital pulse processing system, developed in-house and capable of run- ning in coincidence mode, is used to process the signal from the detectors to a small on-board computer. The entire sys- tem is extremely compact (9 00 dia. 9 30 00 len.) and platform independent, but designed for initial deployment on a research buoy. A variety of commercial and in-house nano- porous chemosorbents have been selected, procured or produced, and these and filter and detector components have been tested. |
| Databáze: | OpenAIRE |
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