JPS5729981A - Drainage monitor - Google Patents

Abstract

PURPOSE:To obtain a monitor having high accuracy, by providing a flow meter and a rectifying body on the watercourse before drainage is made to pass through by means of noncontact, and correcting a measured value by a radioactivity measuring means, by use of a flow quantity signal from the flow meter. CONSTITUTION:Drainage 6 is fed by a feed water pump 1, passes through a flow meter 2, a rectifying pipe 3 and a water pouring nozzle 4, is made to pass through so as not to contact with the inside wall of a pipe 5 of the measuring part, and the drainage 6 is further drained in the direction as indicated with an arrow 7. Clean water is always made to flow by a constant flow quantity alond the inside wall of the pipe 5 of the radiant ray measuring part by a feed pipe 8 and a guide plate 9. Radioactivity of drainage which is poured from the water pouring nozzle 4 is measured by a radiant ray detector 11 surrounded by a shielding body 10, and a counting device 12. A water pouring shape of drainage which is poured from the water pouring nozzle 4 is varied depending on the flow quantity, therefore, correction of a measured value becomes necessary. When correcting, a correcting operation part 14 is provided in advance on the counting device 12, an output of the flow meter 2 is sent by a signal circuit 13, and the correcting operation is executed in accordance with said signal.