Shielding device for radiochemical purity measurement of radioactive thin layer scanner

Abstract

The utility model discloses a shielding device for measuring radiochemical purity of a radioactive thin layer scanner. The shielding device comprises an upper square plate and shielding bodies at the left side and the right side, the upper square plate is provided with a through hole for placing a detector probe of the radioactive thin layer scanner; and the shielding bodies on the left and right sides shield beta, X and gamma rays. The shielding device is arranged right above the probe of the radioactive thin layer scanner, a sample to be measured is arranged on the measuring platform below the probe, the measuring platform moves at a certain speed in the measuring process, and the shielding device can shield radioactive rays in other areas which are not arranged below the probe of the scanner. According to the radiochemical pure measurement device, background signal rise and impurity signal annihilation in radiochemical pure measurement caused by radiation in the radioactivity detection process can be avoided, the authenticity of radiochemical pure measurement is improved, and the measurement accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of radiochemical purity testing, in particular to a shielding device used for measuring radiochemical purity by a radioactive thin-layer scanner. Background Art

[0002] Radiochemical purity refers to the ratio (%) of the radioactivity of a radionuclide in a specified chemical form to the total radioactivity of the nuclide. Currently, the instruments used to measure radiochemical purity include radioactive thin-layer scanners, technetium analyzers, and radioactive flux detectors. However, considering the efficiency, convenience, and data intuitiveness of detection, radioactive thin-layer scanners are still the most widely used. Radioactive thin-layer scanners can measure the radiochemical purity of various nuclide solutions or nuclide-labeled compounds, including β-nuclides. 32 P, γ-nuclides 18 F. 99m Tc, 11 C. 68 Ga, 125 I. 131 I. 123 I etc.

[0003] During radiochemical purity measurements with a radioactive thin-section scanner, radiation from other locations can affect the overall baseline, increasing the background and ultimately drowning out smaller radioactive signals. This can cause the radiochemical purity results to deviate from the true value, thus affecting measurement accuracy. Therefore, a shielding device is necessary for radiochemical purity measurements with radioactive thin-section scanners. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a shielding device for measuring radiochemical purity using a radioactive thin-layer scanner.

[0005] The utility model discloses a shielding device for measuring radiochemical purity using a radioactive thin-layer scanner, comprising: an upper panel and shielding bodies on left and right sides;

[0006] The upper panel is provided with a through hole for accommodating a radioactive thin-layer scanner detector probe;

[0007] The shielding bodies on the left and right sides shield against β, X and γ rays.

[0008] As a further improvement of the present invention, the upper panel is vertically arranged to the left and right shielding bodies, the upper edge of the left shielding body is connected to the left edge of the upper panel, and the upper edge of the right shielding body is connected to the right edge of the upper panel.

[0009] As a further improvement of the present invention, the shielding materials used in the left and right shielding bodies are used to shield β, X and γ rays during the measurement process of the radioactive thin-layer scanner.

[0010] As a further improvement of the present invention, the shielding materials of the left and right shielding bodies include but are not limited to aluminum and organic glass for protection against beta rays, and include but are not limited to lead, iron and tungsten-nickel alloy for protection against X and gamma rays.

[0011] As a further improvement of the present invention, the material of the upper panel includes but is not limited to aluminum, iron and stainless steel.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The shielding device of the utility model is placed just above the radioactive thin-layer scanner probe, and the sample to be measured is placed on the measuring platform below the probe. During the measurement process, the measuring platform moves at a certain rate. The shielding device can shield the radioactive rays in other areas not placed below the scanner probe, thereby avoiding the increase of the background signal during the radioactive detection process and the annihilation of the impurity signal in the radiochemical purity measurement due to radiation, thereby improving the authenticity of the radiochemical purity measurement and improving the accuracy of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of a shielding device for measuring radiochemical purity using a radioactive thin-layer scanner disclosed in one embodiment of the present utility model;

[0015] Figure 2 When setting up a shielding device, place the detector next to the probe. 18 Spectrum of F nuclide solution;

[0016] Figure 3 When no shielding device is installed, place the detector next to the probe. 18 Spectrum of F nuclide solution;

[0017] Figure 4 When setting up a shielding device, place the detector next to the probe. 177 Spectrum of Lu nuclide solution;

[0018] Figure 5 When no shielding device is installed, place the detector next to the probe. 177 Spectrum of Lu nuclide solution.

[0019] In the picture:

[0020] 1. Left shield; 2. Right shield; 3. Upper panel; 4. Through hole. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0024] The present invention is described in further detail below with reference to the accompanying drawings:

[0025] like Figure 1 As shown, the utility model provides a shielding device for measuring radiochemical purity by a radioactive thin-layer scanner, comprising: an upper panel 3 and shielding bodies on the left and right sides, wherein the upper panel 3 and the shielding bodies on the left and right sides are arranged vertically, the upper edge of the left shielding body 2 is connected to the left edge of the upper panel 3, and the upper edge of the right shielding body 2 is connected to the right edge of the upper panel 3; wherein,

[0026] The upper panel 3 is provided with a through hole 4 for placing the radioactive thin-layer scanner detector probe. Preferably, the through hole 4 is a circular hole adapted to the detector probe. The material of the upper panel 3 includes but is not limited to aluminum, iron and stainless steel.

[0027] The left and right shielding bodies 1 and 2 shield β, X, and γ rays. That is, the shielding materials used by the left and right shielding bodies 1 and 2 are used to shield β, X, and γ rays during the measurement process of the radioactive thin-layer scanner. The shielding materials used to protect β rays include, but are not limited to, aluminum and organic glass, and the shielding materials used to protect X and γ rays include, but are not limited to, lead, iron, and tungsten-nickel alloy. As an embodiment: the left and right shielding bodies 1 and 2 can be a double-layer structure, with the inner layer being an aluminum layer or organic glass layer that shields β rays, and the outer layer being a lead layer, iron layer, or tungsten-nickel alloy layer that shields X and γ rays; or, the outer layer being an aluminum layer or organic glass layer that shields β rays, and the inner layer being a lead layer, iron layer, or tungsten-nickel alloy layer that shields X and γ rays. Furthermore: the connection between the left and right shielding bodies 1 and 2 and the upper panel 3 includes, but is not limited to, welding or fixed connection using connectors.

[0028] The shielding device composed of the upper panel 3 and the shielding bodies on the left and right sides can be put on the plastic bracket when in use. The plastic bracket is installed on the fixed platform, and the measuring platform can move at a certain speed on the fixed platform.

[0029] The method for using the shielding device of the present invention includes:

[0030] Before turning on the instrument, first remove the detector probe, then put the shielding device onto the plastic bracket, and then place the detector probe into the round hole on the panel above the shielding device;

[0031] The sample to be tested is placed on the measuring platform. When the measurement starts, the measuring platform below moves at a certain rate. The shielding bodies 1 and 2 on both sides of the shielding device can shield the radioactive rays in other areas not placed under the scanner probe, thereby avoiding interference with the area to be tested.

[0032] Example 1:

[0033] Take a certain radioactive concentration 18 The solution of F nuclide was placed near the detector probe and tested with shielding device and without shielding device respectively. The measurement time was 1min. The spectrum with shielding device is shown in Figure 2 , the spectrum without shielding device is shown in Figure 3 .

[0034] in conclusion:

[0035] Figure 2 The results of the medium-band shielding device show that the background radioactive count rate is around 350. Figure 3 Without a shielding device, the background radioactive count rate is around 500. The shielding device can effectively reduce the impact of radiation by around 150.

[0036] Example 2:

[0037] Take a certain radioactive concentration 177 The Lu nuclide solution was placed near the detector probe and tested with and without shielding devices, respectively. The measurement time was 1 min. The spectrum with shielding device is shown in Figure 4 , the spectrum without shielding device is shown in Figure 5 .

[0038] in conclusion:

[0039] Figure 4 The results of the medium-band shielding device show that the background radioactive count rate is around 50. Figure 5 Without a shielding device, the background radioactive count rate is around 100. The shielding device can effectively reduce the impact of radiation by around 50.

[0040] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A shielding device for measuring radiochemical purity using a radioactive thin-layer scanner, characterized in that: include: The upper panel and the left and right side shields; The upper panel is provided with a through hole for accommodating a radioactive thin-layer scanner detector probe; The shielding bodies on the left and right sides shield against β, X and γ rays.

2. The shielding device according to claim 1, wherein The upper panel is vertically arranged with the left and right shielding bodies. The upper edge of the left shielding body is connected to the left edge of the upper panel, and the upper edge of the right shielding body is connected to the right edge of the upper panel.

3. The shielding device according to claim 1, wherein The shielding materials used in the left and right shielding bodies are used to shield β, X and γ rays during the measurement process of the radioactive thin-layer scanner.

4. The shielding device according to claim 3, wherein: The shielding materials of the left and right shielding bodies include but are not limited to aluminum and organic glass for protection against beta rays, and include but are not limited to lead, iron and tungsten-nickel alloy for protection against X and gamma rays.

5. The shielding device according to claim 1, wherein: The materials of the upper panel include but are not limited to aluminum, iron and stainless steel.

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