| 摘要 |
The apparatus comprises: (a) a single particle detector (5) (b) a plurality of screens (E0, E1, E2), each capable of absorbing particles with energy less than a predetermined energy level (c) means for successively placing these screens in front of the detector for predetermined successive time intervals, and (d) means (17) for counting the particles detected by the detector (5) during these time intervals and for taking differences of particle counts thus carried out with several such screens and for various corrections, evaluation of the population of particles detected in several energy bands, each bounded by at least one of the said predetermined energy levels. Application to the measurement of the contamination of food products by radioactive products. <IMAGE>
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