Medium-resolution autonomous in situ gamma detection system for marine and coastal waters Academic Article uri icon

abstract

  • We are developing a medium-resolution autonomous 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 isotopes ( 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 LaBr 3 detectors in a near 4- configuration around the samples. A compact digital pulse processing system, developed in-house and capable of running in coincidence mode, is used to process the signal from the detectors to a small on-board computer. The entire system is extremely compact (9 dia. 30 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. 2009 Akadmiai Kiad, Budapest, Hungary.

published proceedings

  • Journal of Radioanalytical and Nuclear Chemistry

author list (cited authors)

  • Schwantes, J. M., Addleman, R. S., Davidson, J. D., Douglas, M., Meier, D., Mullen, O. D., ... Santschi, P. H.

citation count

  • 6

complete list of authors

  • Schwantes, JM||Addleman, RS||Davidson, JD||Douglas, M||Meier, D||Mullen, OD||Myjak, M||Jones, ME||Woodring, ML||Johnson, B||Santschi, PH

publication date

  • December 2009