Answer to Question #4427 Submitted to "Ask the Experts"
The following question was answered by an expert in the appropriate field:
I wish to carry out tomography on a gas-liquid (water)-solid system, wherein, a gas (air) and a solid (quartz/sand or glass beads) having wide variations in density are encountered, thereby requiring special attention towards the type of source and its strength for a particular material. In short I wish to conduct dual-energy tomography. Can you help me with some suggestions or references wherein I can find out the basics about dual-energy tomography and related things about it?
Would it be necessary to use two different types of sources at the same time?
Can the attenuation caused by air and sand/quartz or glass beads be quantified separately?
It sounds like the materials (water, air, glass) that you want examined are suitable for conventional/medical CT examination (computed-tomography examination), unless you desire extremely fine spatial resolution. If you can transport the sample to a nearby hospital that has a CT scanner, you might ask if someone there could check it out for you. If you have other special considerations that absolutely require dual-energy tomography, see the following references for more details:
It appears a single x-ray source can be used for dual-energy tomography.
John P. Hageman, MS, CHP
Answer posted on 14 April 2005. The information posted on this web page is intended as general reference information only. Specific facts and circumstances may affect the applicability of concepts, materials, and information described herein. The information provided is not a substitute for professional advice and should not be relied upon in the absence of such professional advice. To the best of our knowledge, answers are correct at the time they are posted. Be advised that over time, requirements could change, new data could be made available, and Internet links could change, affecting the correctness of the answers. Answers are the professional opinions of the expert responding to each question; they do not necessarily represent the position of the Health Physics Society.
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