PGNAAPrompt Gamma Neutron Activation Analysis
PGNAAPhi Gamma Nu Delta Theta Alumni Association
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The prompt gamma-ray spectrum from a La[Cl.sub.3]:Ce detector was measured using the portable neutron generator-based PGNAA set up described earlier [8] and shown in Figure 1.
The spectrum shows background gamma-ray peaks from detector material as well as shielding material used in the PGNAA setup.
The calculations were carried out for the 2.5 MeV neutron-based PGNAA setup using the procedure described earlier [8].
The minimum detectable concentrations (MDCs) of the Ce[Br.sub.3] detector-based PGNAA setup were determined for 517, 786-788, 1165, 1951-1959, 2863, 6111, 6619, and 8578 keV Cl gamma rays using the method published earlier [8].
Then multigamma-ray detection capability of a cylindrical 75 mm x 75 mm (diameter x height) Ce[Br.sub.3] detector has been tested by analyzing the chlorine concentration in water samples using eight chlorine prompt gamma rays 517, 786-788, 1165, 1951-1959, 2863, 6111, 6619, and 8578 keV chlorine over 517 to 8578 keV energies utilizing a D-D portable neutron generator-based PGNAA setup and measuring the corresponding minimum detection limit (MDC) of chlorine.
Caption: Figure 1: Schematic representation of the MP320 portable neutron generator-based PGNAA setup used to measure the prompt gamma-ray yields.
ARL 9900, Advantx or Optim'X) and the Thermo Scientific CB Omni or CB Omni Flex online PGNAA analyzers.