|Student Name:||Mischa L. Monroe, 1st Lt|
|Thesis:||FORENSICS ANALYSIS FOR ELEMENTAL IDENTIFICATION IN DEBRIS SAMPLES UTILIZING MICRO-XRF, SEM, AND AUTORADIOGRAPHY MAPPING|
|Location:||ENP Conf Rm, Rm 217/Bldg 640|
|Date & Time:||01/29/2013 at 1300|
|Abstract:|| A suite of radiochemical analytical techniques, both nuclear and chemical, can be utilized to examine fallout debris from a nuclear event. The ability to quickly interrogate and analyze the results of samples from this debris constitutes an important capability for determining technology of weapon used and to provide attribution to weapon source. Autoradiography was used to characterize fallout debris from a single 239Pu test shot at the Nevada Test Site. The samples were found to have widely varying activities and optical qualities, due to the radiochemical formation. Two other techniques, micro-XRF (x-ray fluorescence) and scanning electron microscopy (SEM) were leveraged to support the initial findings of the autoradiography. The SEM results characterize the elemental distribution on the hemispheric surface and the major elements of the bulk material were qualified. The results of micro-XRF include spatial maps and sum spectra including major and minor elements calcium, iron, titanium, chlorine, potassium, manganese, zinc, strontium, and zirconium. Elements detected using SEM include silicon, oxygen, aluminum, potassium, magnesium, iron, sodium, chlorine, and carbon. The spatial maps were compared by element to autoradiography and it was shown calcium matches closely to autoradiography results, suggesting the alpha emitters are co-located with calcium.