| 摘要 |
1,103,562. Radiometric analysis. HILGER & WATTS Ltd. April 5, 1965 [April 8, 1964], No. 14580/64. Heading G1A. When carrying out continuous radiometric analysis of a slurry, constituents are identified by the characteristic radiation excited by radiation from a radio-active source, quantitative results being obtained by measuring also the density of the slurry in terms of the absorption of radiation from a second source. As shown, slurry is fed at 16 to a constant level device 14 and thence to a tank 2 evacuated by a pump 15. The slurry is agitated by paddles 3, 33 and fed by a pump 5 through a chamber 9 where a detector 10 measures the absorption of radiation from a source 8 in the 600-3000 keV range, such as caesium 137. The slurry then passes through a sample cell 11 where the secondary radiation excited by radiation from a source 12 is measured by a detector 13. Alternatively the transmitted primary and secondary radiations may be measured together. Depending on the sample under investigation, the source 12 may be iron 55, tritium, helium 3, strontium 85, cadmium 109, promethium 147 or americium 241'. In the cell 12 the sample passes in a thin layer between a rigid wall and a flexible adjustable wall. The velocity of flow can thereby be adjusted. By imparting an acceleration to the sample a compensation can be effected for the relatively less effective sensitivity to radiation of the larger slurry particles since they are also less accelerated and remain longer in the irration field. |
