SU1255907A1 - Method of x-ray radiometric testing of ore - Google Patents

Abstract

The invention relates to the X-ray radiometric analysis of the elemental composition of complex substances and is used to test the broken rock mass transported in containers, on conveyor belts, etc. Improving the reliability and productivity of ore testing is achieved by eliminating mechanical movements of the probe. The ore to be tested is irradiated with x-rays or gamma rays, and characteristic and scattered radiation are recorded. In the spectrum of scattered radiation, the intensity of -in quanta on opposite slopes of the peak of the distribution of the energies of the scattered radiation quanta is recorded in energy intervals that are equal in length to the maximum and equal in magnitude. The radiation intensities in these intervals are compared and a correction is made for variations in the spectrum caused by a change in the sensor-ore distance. This amendment is automatically in the process of analysis introduced into the relationship, which determines the content of the analyzed elements in the ore. 1 il. (L. Yu ate; o

Description

The invention relates to the field of nuclear physical analysis of materials of complex material composition and can be used to test mined ores in the process of their transportation.

The purpose of the invention is to increase the reliability and productivity of ore testing by eliminating the mechanical movements of the probe.

The drawing shows a device for implementing the method.

The device contains a probe consisting of a primary radiation source 1 and a secondary radiation detector 2, the output of which is connected to the information information input of the data processing unit 3 by X-ray radiometric analysis techniques and to the input of discriminators 4 and 5, the scattered radiation spectrum located symmetrically with respect to the peak, the discriminatoro outputs are connected to the corresponding inputs of the comparison unit 6, the output of which is connected to the R input of the correction of the test results correction block 7, and to the information The input of block 7 of the correc- tion is connected to the output of block 3 of data processing using X-ray radiometric analysis techniques.

Replacing the mechanical movement of the probe during testing and keeping it at a given distance from the ore, by introducing an appropriate correction to the test result, excludes the unreliable and inertial unit itself — the mechanism for moving the probe — which increases the reliability of the equipment and improves the testing performance, since it does not need to spend time moving and placing the probe at a given distance from the ore.

The positive effect of the sampling method is due to the following operations during the testing process: isolating the spectral areas of the scattered radiation, comparing the radiation fluxes in these areas and introducing an appropriate correction to the X-ray radiometric analysis, compensating for the effect of the variation of the sensor-ore height on the results of the analysis testing. .

Example. The analyzed ore is irradiated with cesium-137 isotope radiation. Secondary radiation is recorded

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A scintillation detector based on Nal (TI) crystal and PMT-139 is used. The secondary radiation spectrum is examined with an AI-256 analyzer. The change in the spectrum of scattered radiation with a variation in the sensor-ore distance is estimated using two differential discriminators that distinguish the parts of the spectrum that are symmetrically located with respect to the peak of scattered radiation, with a variation in the sensor-ore distance of 0.25-0.75 m.

Depending on the result of the comparison of the discriminator signal ratio, a corresponding amendment is introduced into the analysis result, performed according to the spectral intensity and spectral ratio methods. The sensor and amplifier spectrometry paths are covered by an auto-stabilization system to eliminate the instability of the energy scale. The gradients of change of the measured parameter and the correction signal have opposite signs depending on the variation of the sensor-ore distance. Moreover, the gradient of the correction signal can be changed, highlighting the corresponding parts of the spectrum of scattered radiation, and, thus, to compensate for changes in the measured parameter while varying the distance of the sensor - ore.

Claims (1)

Invention Formula The method of X-ray radiometric testing of ores using a measuring probe consisting of a primary radiation source and a secondary radiation detector, consisting in irradiating the ore with X-rays or gamma quanta, recording the intensities of the characteristic and scattered ores and determining the measured contents of elements, characterized in that , in order to increase the reliability and performance of sampling by eliminating the mechanical movements of the probe, the intensity scattered from Scientists measured in two regions spektra.ravnoy energy width, arranged symmetrically with respect to a preselected position of the peak of the scattered radiation are compared 312559074 The measured values, based on their ratio of the probe – ore ratio, and enter it in determine the amendment to change the result of testing. Editor A. Shandor Compiled by V.Prostakova Tehred M. Khodanich Proofreader V, But ha Order 4814/42 Edition 778 Subscription BNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4