SU748321A1 - Device for determining the depth of location of radioisotope reference points in soil massif - Google Patents

Description

(54) DEVICE FOR DETERMINATION OF THE DEPTH OF LOCATION OF RADIO-IZOTOPNY REPERE IN SOIL MASSIF

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The invention is related to the field of studying the physical properties of soil massifs by radioisotope methods and can be used to determine the depth of the location of radioisotope benchmarks when monitoring layer-by-layer deformations of soil massifs.

Devices are known for determining the depth of the location of radioisotope benchmarks, containing a well-measuring probe with a detector, connected at; the help of a measuring cable with a measuring console located on the surface; Determining the depth of the radioisotope reference made by the cable at the moment the maximum of the signal from the measuring probe,

The device is more perfect. This device, being the closest to the proposed one, is adopted for the proto-20 type. The device according to the prototype consists of a downhole measuring probe connected by a measuring cable with a measuring console located on the surface.

The measuring probe contains two detectors located at some distance from each other and recording the radiation flux from the reference frame. The depth of the frame is determined by processing the dependence of the signal detectors on the depth of the measuring probe in the well.

The disadvantage of the prototype device is low sensitivity in detecting frames that create a discharge flux density on the well axis. Such cases arise in practice due to the large depth of laying the reference point in the wall of the well, in connection with the fallout of the radioisotope in the reference frame over time, and also because of the reference point departure from the well in the presence of horizontal strains in the soil mass.

The purpose of the present invention is to increase the sensitivity of the device for determining the depth of the location of radioactive references in the soil mass.

This goal is achieved by studying two-electrode and three-electrode detectors, and located in the same horizontal plane, and the control electrode of the three-electrode detector is connected to an integrated circuit connected in a two-electrode circuit.

The block diagram of the proposed device is shown in FIG. one; and the electrical connection diagram of the detectors in FIG. 2

A device for determining the location of radio isotopic reference points in a soil array consists of a three-electrode detector 1, a two-electrode detector 2 and an electric circuit 3, by transmitting the voltage at the output of the detector 2 to the control electrode of the detector 1 ...

Determining the depth of the radio isotope reference points by the proposed device is performed as follows: A measuring probe consisting of a three-electrode detector 1, a two-electrode detector 2 and an electric circuit 3 are lowered into the soil array 6 by means of a measuring cable 4. detectors 1 and 2 begin recording the radiation flux from the reference frame. As the measuring probe approaches the reper 7, the radiation flux on detectors 1 and 2 increases. This increases the voltage on the integrating cell 8, causing an increase in potential at the control electrode of the three-electrode detector 1, as a result of which the efficiency of radiation detection by the detector 1 increases.

The potential at the control electrode and the efficiency of the detector 1 will increase until the measuring probe reaches the horizontal on which the radioisotope reference 7 is located, and after passing this horizontal will decrease. As a result, the signal transmitted by detector 1 to the recorder will be much more sensitive to the location of the measuring probe relative to reference 7 than the signal generated without a change in potential at the control electrode. The maximum signal of the detector 7 in the soil array is determined from the maximum signal of the detector 1 using a measuring cable 4. 6. The position of the other benchmarks is similar.

Thus, in the proposed device, the sensitivity of determining the location of radioisotope reference points in the soil massif is increased.

F o r mula inventions

A device for determining the depth of the X-ray radiotrophic reference points in the soil array, containing a measuring probe with two detectors, a measuring cable with a recorder, and with a view to increasing the sensitivity, one of the detectors is made three-electrode, and another two-electrode electrode and its output through an integrating chain is connected to a control electrode of a three-electrode detector connected to a recorder, with the detectors located in the same horizontal plane.

Sources of information taken into account in the examination

1. USSR author's certificate number 462155, cl. G O1V 5/00, 1971.

2. US patent number 38696O7,

cl. Q O1 V 5 / OO, published. 1971 (prototype).

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Claims (1)

Claim A device for determining the depth of the location of the radioisotope benchmarks in the soil mass, containing a measuring probe with two detectors, a measuring cable with a recorder, characterized in that, in order to increase sensitivity, one of the detectors is made of three-electrode and the other two-electrode and its output through an integrating circuit is connected to a control electrode of a three-electrode detector connected to a recorder, the detectors being located in one horizontal plane.