Office of Technology Transfer – University of Michigan

Louvered Area Detector for Radiation Spectrometers

Technology #1668-1

UM File # 1668.1

Background
In situ gamma-ray spectrometry determines the quantities of radionuclides in some source medium with a portable detector. The more established method of laboratory gamma-ray spectroscopy consists of taking small samples of the medium into the laboratory for gamma-ray analysis. In situ gamma-ray spectrometry characterizes a larger volume of material, requires less time to determine accurate radionuclide concentrations, and minimizes worker doses and the risk of radioactive contamination. The main limitation of in situ gamma-ray spectrometry lies in determining the depth distribution of radionuclides. In addition, as it is not uncommon for low levels of anthropogenic radionuclides to be present in smaller quantities than natural radionuclides, it is important that the detection system also possess a sufficient gamma-ray detection efficiency for reasonable counting times.
Technology Description
Researchers at the University of Michigan have developed improved method and system for detecting ionizing radiation such as for radiation survey and detection purposes. In particular, a method for detecting ionizing radiation emitted by a material located over an extended area is provided, wherein there is no need to move a radiation detector having a detection axis perpendicular to the area and located within a detector space. The method includes allowing ionizing radiation over a narrow range of polar angles relative to the detection axis to enter the detector space and be detected while shielding ionizing radiation outside this range of polar angles.
Applications • Detection of ionizing radiation.
Advantages • Enhanced sensitivities and portability.