Emeritus Professor of Physicselmore@purdue.edu
Office: Physics S153A via 8A
Telephone: (765) 494-6516
Pager: (765) 423-5172
Cell: (765) 412-2174
Fax: (765) 496-7228
B.S. Physics, Case Institute of Technology (Cleveland, OH), 1968.
Ph.D. Physics, University of Rochester (Rochester, NY), 1974.
My group's research interest are centered on applications of accelerator mass spectrometry (AMS). We operate a tandem electrostatic accelerator in the department of Physics to measure very low concentrations of the natural and man-made radionuclides 10Be, 14C, 26Al, 36Cl, 41Ca and 129I. Chemical preparation of samples is carried out in the Department of Chemistry. Accelerator mass spectrometry was developed, starting in the late 1970’s, for directly counting these radionuclides, improving the sensitivity by many orders of magnitude over conventional decay counting techniques. The Purdue Rare Isotope Measurement Laboratory (PRIME Lab) is one of only a few facilities in the nation capable of measuring these nuclides. We continue to improve the capacity and detection limits and routinely measure these nuclides in a wide range of sample types for both Purdue-based and external research projects. We encourage you to submit to us short seed proposals to fund sample measurements for feasibility studies prior to application for funding from the NSF or other agencies. Additional information is available on our web site http://www.physics.purdue.edu/primelab/.
This year we have made changes inside the accelerator to improve stability at high voltages and new run as high as 9 megavolts. This allows higher sensitivity especially for measuring 36Cl and 41Ca. We have designed and built a new cesium sputter ion source that will produce much higher beam currents especially for beryllium and aluminum. We are now testing the source and will install it on the accelerator in 2004. Other projects we will tackle soon are an upgrade to the stripper system at the accelerator terminal, a new beam line that will include a gas filled magnet for better isobar separation, and a faster data analysis system.
Our group continues to apply AMS to problems in biomedicine. Osteoporosis is a disease characterized by decreased skeletal mass and increased susceptibility to bone fractures. The health care costs related to hip fracture alone exceed $14 billion per year in the U.S. We are investigating the use of soy isoflavones as an alternative to estrogen replacement therapy for postmenopausal women by labeling the skeleton with 41Ca and then later monitoring 41Ca excreted in the urine on a weekly basis.
Lectured introductory calculus-based mechanics and calculus-based electricity and magnetism. Introduced the McDermott tutorials to the mechanics course (1800 students per year). Presently lecturing algebra-based mechanics to technology students using peer instruction with response pads and just-in-time reading quizzes.
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