Comparative Neutron Radiography Analysis of Siliceous Marine Sponges: Dragmacidon lunaecharta

Amanda Smolinski, College of Science and Engineering-Biology, Idaho State Univeristy 921 S 8th Ave Pocatello, Idaho 83201 Dr. Joshua Kane, Glen Papaioannou, and Dr. Aaron Craft, Advanced Post Irradiation Examination and Characterization, The Idaho National Laboratory 1955 N. Fremont Avenue Idaho Falls, ID 83415

Climate change and anthropogenic pollution are causing rapid changes to the world’s oceans and the ecosystems contained within them. Porifera (sea sponges) have been shown to be useful biomarkers for heavy metal accumulation. Traditional analysis requires the destruction of samples. Given the stress being placed upon marine species, this work seeks to create a viable process to evaluate heavy pollution without destroying the specimen, allowing it to be passed on to other researchers for further evaluation. Success of nondestructive analysis would allow for use of museum quality and other privately held historical specimens to be evaluated and returned to their owner. The data could generate historical and current maps of oceanic pollution to aid in generating future forecasts for the movement of pollutants and the development of successful remediation and marine habitat management strategies. 

Six specimens of Dragmacidon lunaecharta were exposed to different concentrations of cadmium chloride contaminated sea water, to explore both the heavy metal uptake in the organisms and the capability of different imaging techniques. Cadmium was chosen due to its high neutron absorption cross section and its role as a highly toxic pollutant. Neutron imaging was performed at the Neutron Radiography (NRAD) reactor at Idaho National Laboratory using both digital and indirect film radiography. Multiple artifacts are visible in both sets of neutron radiography images. Comparison with neutron activation analysis data from previous experiments indicates these artifacts had a high probability of being cadmium.  Prompt gamma analysis was performed at Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II) facility to confirm the identity if these artifacts. Neutron Computed Tomography, utilizing cold neutrons, was performed at the advanced neutron tomography and radiography experimental system (ANTARES-FRM II), to reveal the structure and distribution of the Cd deposits, allowing for volumetric analysis.

Additional Abstract Information

Presenter: Amanda Smolinski

Institution: Idaho State University

Type: Oral

Subject: Ecology

Status: Approved

Time and Location

Session: Oral 5
Date/Time: Tue 12:30pm-1:30pm
Session Number: 510
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