TY - CONF TI - Locating gamma radiation source by self collimating BGO detector system AB - The need for airborne collimated gamma detector system to estimate the radiation released from a nuclear accident has been established. A BGO detector system has been developed as an array of separate seven cylindrical Bismuth Germanate scintillators, one central detector symmetrically surrounded by six detectors. In such an arrangement, each of the detectors reduced the exposure of other detectors in the array to a radiation incident from a possible specific spatial angle, around file array. This shielding property defined as `self-collimation`, differs the point source response function for each of the detectors. The BGO detector system has a high density and atomic number, and therefore provides efficient self-collimation. Using the response functions of the separate detectors enables locating point sources as well as the direction of a nuclear radioactive plume with satisfactory angular resolution, of about 10 degrees. The detector`s point source response, as function of the source direction, in a horizontal plane, has been predicted by analytical calculation, and was verified by Monte-Carlo simulation using the code EGS4. The detector`s response was tested in a laboratory-scale experiment for several gamma ray energies, and the experimental results validated the theoretical (analytical and Monte-Carlo) results. (authors). AU - "Orion, I" AU - "Pernick, A" AU - "Ilzycer, D" AU - "Zafrir, H [Israel Atomic Energy Commission, Yavne (Israel). Soreq Nuclear Research Center]" AU - "Shani, G [Ben-Gurion Univ. of the Negev, Beersheba (Israel)]" KW - "44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS" KW - "54 ENVIRONMENTAL SCIENCES" KW - "BGO DETECTORS" KW - "CALIBRATION" KW - "AERIAL SURVEYING" KW - "COLLIMATORS" KW - "GAMMA SPECTRA" KW - "MONTE CARLO METHOD" KW - "POINT SOURCES" KW - "SPECTRA UNFOLDING" DO - https://doi.org/ UR - https://www.osti.gov/etdeweb/servlets/purl/475985 PB - CY - Israel PY - 1996 DA - 1996-12-01 LA - English J2 - [] VL - C1 - Israel Nuclear Society, Yavne (Israel) C2 - C3 - INIS-mf-15507; CONF-961252- C4 - C5 - INIS; OSTI as DE97616259 L3 - Conference: 19. conference of the Israel Nuclear Societies, Herzliya (Israel), 9-10 Dec 1996; Other Information: PBD: Dec 1996; Related Information: Is Part Of Program and book of abstracts; PB: 149 p. ER -