Compact Gamma Ray Source for On-Site Calibration of Radiation Detectors

This project develops a portable gamma ray source for on-site, high energy calibration of gamma ray and X-ray detectors. Scintillators and high purity germanium (HPeG) detectors are routinely calibrated at low energy using natural radioactive isotopes such as 137Cs (0.662 MeV) and 60Co (1.17, 1.33 MeV). At high energies, however, there is no portable device for calibrating the energy and dose measurements of these detectors. The novel gamma ray source uses neutrons generated from the deuteron fusion reaction. Prompt gamma rays with a known energy spectrum are produced when some of the neutrons are captured in a suitable moderator. The gamma ray source is used to calibrate other gamma ray detectors. In collaboration with the Lawrence Berkeley National Laboratory, DULY Research Inc. will design a compact neutron generator with a yield as high as 108 1010 n/s. A variety of material and shape of the moderator will be chosen to produce prompt gamma rays up to 10 MeV by radiative capture of the neutrons. Commercial Applications and Other Benefits: The gamma ray source with discrete energy levels and known intensities can be used for on-site calibration of different types of radiation detectors, among them are radiation monitors for homeland security use at seaports, airports and other government facilities. Other users include universities, research institutions and astrophysical observatories, as well as industries. The neutron generator as a stand-alone product will also have copious uses such as material science research, interrogation of special nuclear material and neutron radiography.