Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Nukleonika

2 2012

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Trace analysis of Indonesian volcanic ash using thermal and epithermal neutron activation analysis

Canion B., Jacques C., Landsberger S., Taftazani A.

Nukleonika

2012

Vol. 57, No. 4

585-589

There is continued great interest in determining the trace element and heavy metal content of volcanic ash for a variety of reasons. The motivation stems from the desire to understand the geochemistry of volcanic ash in imbedded geological formations, the impact on seawater, and the possible release of toxic elements into the environment that may impact livestock grazing and water systems. Ash from volcanic plumes can go as high 8-18 km thus affecting climate and air traffic. We have employed Compton suppression neutron activation analysis (NAA) with thermal and epithermal neutrons to determine trace elements in volcanic ash from Indonesian eruption of Mount Merapi in October 2010. We found a wide range of elements, including several rare earth elements.

Analysis of naturally occurring radioactive material using neutron activation analysis and passive Compton suppression gamma - ray spectrometry

Landsberger S., George G., Lara R., Tamalis D., Louis-Jean J., Dayman K.

Nukleonika

2012

Vol. 57, No. 4

461-465

Naturally occurring radioactive material (NORM) still remains a problem in oil and gas exploration. Radioactive wastes from oil and gas drilling take the form of produced water, drilling mud, sludge, slimes, or evaporation ponds and pits. In many parts of the USA the soil contains radioactivity that is then concentrated in mineral scales on the pipes, storage tanks and other extraction equipment. The radionuclides 226Ra and its one of daughter products 210Pb and 228Ra from 232Th are the primary radionuclides of concern in the waste. We have investigated the concentrations of heavy metals in NORM using neutron activation analysis (NAA) as well as using passive radioactivity counting using Compton suppressed gamma-ray spectrometry. With a low-energy germanium counter and the Compton suppression system low detection limits were achieved to measure 226Ra, 228Ra and 210Pb. Results have shown very elevated amounts for these radionuclides as well as the heavy metals of barium and strontium.