Status of Prompt Gamma Neutron Activation Analysis at TRR-1/MI

摘要

The first prompt gamma activation analysis was designed, constructerd and installed at a 6 inch diameter neutron beam port of hte Thai Research Reactor-1/Modified 1 since 1989. Beam characteristics were made by Gd foil irradiation, X-ray film exposing and densitometry scanning consequently. The thermal neutron flux at sample position was measured by au foil activation, and was about 1*10 sup 7 n.cm sup 2.sec sup -1 at 700 KW operating power. The experiments have bee nconducted successfuly. In 1998, the PGAA facility has ben developed for hte reactor operating power at 1.2 MW. The new PGAA system, e.g., beam shutter, gamma ocllimator and biological shields have been designed to reduce the leakage of neutrons nad gamma radiation to the acceptance levels in accordance with the internatioinal commission on Radiatin Protection Publication 60. The construction and installation will be completed in April 1999.