SU927051A1 - Two-axis detector of soft x-ray radiation - Google Patents

Abstract

TWO-COORDINATIC DETECTOR. SOFT X-RAY RADIATION FOR diffractometry of single crystals, which is a sealed chamber with an anode and the first cathode in the form of wire electrodes and the second cathode in the form of a solid electrode, used as the reference, I will have the same I, I will have the same I, I will have the same I, I will have the same, I will have the same I, I will have the same I, I will have the same I, I will have the same I, I will have the same I, I will have the same I, I will have the same I, I will have the same I, I will have the same I, I will have the same I, I will have the same I, I will have the same I, I will have the same I, I will have the same, I will have the same I, I will have the same I, I will have the same I, I will have the I, I will have the I, I will have the I, I will take it to me, I will be, I will be, I will, I am not the one, I am not the one, I, I am not the one, I, I am not the one, I am I, I am I, I am I am going. and the detection efficiency of X-rays of the detector over the area and an increase in the efficiency, an additional wire electrode was inserted into the black, and the entrance window of the chamber was made of film conducting The X-ray transparent material of a given energy, and the detector is equipped with a device for varying the distance between the input window and the additional electrode.

Description

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The invention relates to the field of X-ray detectors in the energy range up to 20 keV and can be used in a vanikmaych laboratory with X-ray structural studies in the field of molecular biology and metal physics.

It is widely known to use for X-ray analysis of a two-dimensional detector - photographic film. This detector does not provide the requirements of modern X-ray diffractometry in terms of accuracy, sensitivity, and mainly speed, especially for experimenting on single crystals of proteins.

A two-dimensional detector for X-ray diffractometry is known, which is a proportional chamber with two wire electrodes (an anode and a first cathode). which is also the input window 1.

The disadvantages of this detector are: the heterogeneity of the detection of X-ray radiation over the detector area due to the heterogeneity in the thickness of the alcine gland to {5yti, especially when mylar is stretched;

the unreliability of the detector due to burnout of the aluminum coating and possible burning of the Mylar when used as a cathode electrode in high-voltage electric fields.

Closest to the present invention is a two-coordinate soft X-ray detector, which is a sealed chamber with an inlet window and two wire electrodes (anode and first cathode) and a solid electrode (second cathode of 1 mm beryllium-vacuum, also serving as the input window of the camera) , The registration efficiency of this detector is less than 50% for SiC X-rays. 2

The disadvantages of this detector are the insufficient homogeneity of the X-ray detection across the detector area and the low efficiency due to the use of a thick input electrode with possible / local variations in thickness and insufficient flatness, as well as high cost, especially when using beryllium plates. large area ..

The purpose of the invention is to increase the homogeneity and efficiency of the registration of x-rays of the detector — by increasing the efficiency and increasing its efficiency.

Set, the goal is achieved by the fact that in a two-coordinate detector

X-ray diffraction for diffraction, which is a hermetic chamber with an anode and a first cathode in the form of wire electrodes and a second cathode in the form of a solid electrode, which serves as the entrance window of the chamber, introduced an additional wire electrode and the entrance window of the chamber is made of conductive film material, X-ray transparent given energy, the detector being equipped with a device for varying the distance between the entrance window and the additional wire electrode

The input window is made of a film-conducting material, to which a small negative voltage is applied with respect to the additional wire electrode. The electric field between the entrance window and the additional wire electrode is low, which completely eliminates the possibility of damage to the film conductive coating. The absorber of soft X-ray radiation is a layer of working gas limited by the entrance / window and supplement with a 5th wire electrode. The wire electrodes are connected to the appropriate recording devices connected to the computer. The width of the gas layer of the absorbent (between the entrance window and the first wire electrode) is selected depending on the required uniformity of the efficiency of X-ray detection by the detector.

The drawing shows a diagram of the proposed detector, where 1 is a case, 2 and 3 are wire electrodes, 4 is an additional wire electrode, 5 is an entrance window made of film conductive material, 6 is a device for adjusting the distance between the input window and an additional electrode.

The work of the detector is happening. following way.

Multi-energy X-ray beam. Practically without attenuation, the ray passes through the detector input window, converts mainly on filler gas atoms in the volume bounded by the entrance window and an additional wire electrode, as a result of which the electrode wires do not introduce significant local inefficiency into the detector.

The electrons formed as a result of the conversion drift under the action of a weak electric field towards the additional wire electrode and are fed into a high-voltage electric field, where they are recorded using electrodes 2, 3 and 4.

E 927051

Experimental testing of the i-XeH-rreHOBCKHX rays (C < 1 >) with the dual-core inat detector detects about 80%. This error

large area showed that when determining the coordinates of the padding

when the x-ray detector input is optimal for the inter-slot spacing and the additional electrode does not deteriorate at the pad angles, the non-uniformity of the register efficiency differs

X-ray radios do not exceed from normal to 0% of 2%. Efficiency of registration.

Claims (1)

Xy DETECTOR soft X-rays for 'diffractometry single crystals representing a sealed chamber with an anode and a first cathode in the form of a wire electrode and the second to and then · ¹ dem as a continuous electrode serving as the input window of the chamber, about tlichayuschiysya in that, in order to increase homogeneity and efficiency of detecting x-rays of the detector over the area and increasing efficiency, an additional wire electrode is introduced into the negro, and the input window> of the camera is made of a conductive film mat rial which is transparent to X-rays of a given energy, with the detector provided with a device for varying the distance between the entrance window and a further electrode. f