[en] The invention has been aimed at a procedure and equipment for a radiometric assay of the content of bulk materials moved by conveyor belts. In particular it can be used for quantity and ash content determinations of lignite discharges by means of a radiometric conveyor-type weigher and ash content meter. The average radiometric mass attenuation coefficients of hard and soft gamma irradiation of the lignite-multisubstance mixture have been determined for low and high ash contents by ultimate analysis. A radiometric mass attenuation coefficient correlation has been formed and used for control and correction of the measured values of the conveyor-type weigher and ash content meter

[en] The invention has been aimed at a circuitry for the automatic tare balancing at radiometric weigh-feeder belts with digital data processing of the measurement pulse rate emitted by a radiation detector during a measuring cycle. To secure a non-perturbational and exact permanent pulse rate correction by the tare rate the measuring pulse rate is summed up under the operational mode 'taring' for a preselected rotation time of the empty belt and evaluated using a factor related to the length of measuring cycle. The resulting pulses are stored as an average value. Under the operational mode 'weighing' the difference between pulse rate and stored tare pulses will be formed and transmitted to a data processing unit

[en] This invention has to do with a procedure and device for the simultaneous radiometric determination of quantity, quality and foreign substances in moved bulk materials in particular lignite at one measuring point. The section of the bulk material discharge is transmitted by nuclides for soft and hard gamma radiation in pairs. The pulse rates are registered in pairs by means of detectors and evaluated in real-time operation

[en] This invention relates to a conveyor belt balance for weighing bulk materials by utilizing the method of transmitted radiation with narrow collimated measuring channels and evaluation by polynomial approximation

[en] The RAMM measuring system, produced at ORGREB-Institute for Power Stations, is specially designed for the on-line determination of ash content directly at lignite streams. It operates according to the well known principle of two-energy transmission. The nuclides ²⁴¹Am and ¹³⁷Cs are used. The detector unit contains one scintillation probe with an NaI crystal and the capability for spectrometric evaluation of the radiation. There are several variants of the RAMM system electronics, tailored to specific user requirements. The RAMM ash meter determines ash content (in per cent) and output (in t/h) for the evaluation of the coal stream. Inserted directly into the conveying system without any prepreparation of the coal, the RAMM system can evaluate the coal quality regime in open air mines and in power plants. The measuring accuracies attainable by the RAMM system for lignite are ±2-5% ash content absolute and ±5% t/h output. The amortization time for the investment in RAMM is less than one year. Experience has also been gained in the use of the RAMM system for measuring the ash content of coal and peat and the iron content in iron ore. (author). 7 figs