Andrew Rosenstrom is a Ph.D. student in NSSPI investigating the design optimization of bremsstrahlung yield for compact linear accelerator targets. Bremsstrahlung photons will be harnessed to scan cargo containers and trucks that could potentially be transporting special nuclear material or other illicit material with the Stanford Linear Accelerator Center Radiation Physics Group in a collaboration between Texas A&M University’s Radiological Engineering, Detection, and Dosimetry (RED2) Laboratory under Dr. Dewji. The optimization of the target includes the optimization of the energy spectra for x-ray radiography, angular distribution of bremsstrahlung emissions, reduction of secondary electrons, shielding, target heating, accessibility of an operator using the device, and dose estimation to stowaways. Design optimization is being conducted preliminary with Monte Carlo simulations using the FLUKA code.
Additionally, Rosenstrom is working on an auxiliary project estimating the external dose persons using ICRP reference phantoms exposed to prompt and delayed radiation using source terms from the RERF Hiroshima and Nagasaki atomic bomb survivor data. Rosenstrom graduated from the Georgia Institute of Technology with a BS in Nuclear and Radiological Engineering and a minor in philosophy in May 2019. He has interned at Lawrence Berkeley National Lab in the accelerator physics and applied technology division where he helped to develop a mobile associated particle imaging system aimed at producing volumetric distributions of carbon and other isotopes 75000 cubic centimeter samples of soil. Rosenstrom specifically worked to verify the neutron emission rate through the development of a dead time independent rate estimate algorithm and characterized the LaBr and NaI detection efficiency throughout the measurement space through experimental and Monte Carlo methods. He now works with Dr. Dewji at TAMU and the Stanford Linear Accelerator Center.