Method capable of simultaneously detecting alpha / beta / gamma / n rays

Abstract

The invention discloses a method capable of simultaneously detecting alpha / beta / gamma / n rays, a detector is obtained, the detector comprises a shell, a partition plate is arranged in the shell to divide the interior of the shell into an upper detection layer and a lower detection layer, and a detection opening is formed in the position, corresponding to the upper detection layer, of the shell; a scintillator I capable of detecting alpha / beta rays and a corresponding detection circuit I are mounted in the upper detection layer; a scintillator II capable of detecting gamma / n rays and a corresponding detection circuit II are mounted in the lower detection layer; the detector is arranged in a radiation environment to be detected, a total response curve of alpha / beta rays is obtained by using the scintillator I and the detection circuit I, the ratio of the Prompt part to the Delayed part is obtained by dividing the area of the Delayed part by the area of the Prompt part, signals of the alpha / beta rays are distinguished according to the ratio, and signals of gamma / n rays are distinguished according to the ratio in the same way.

Description

Technical Field

[0001] The present invention relates to the technical field of radioactive detection, and in particular to a method capable of simultaneously detecting α / β / γ / n rays. Background Art

[0002] Radioactive dust, radioactive leakage from nuclear accidents, and secondary nuclear radiation disasters will all lead to radioactive contamination. In the application scenarios of radioactive contamination measurement, α / β / γ / n rays generally exist at the same time, forming a mixed radiation field. In existing instruments, α / β rays are generally detected by the same device, and γ / n rays are generally monitored separately. There are also γ / n mixed detection dosimeters. Therefore, in this mixed radiation field, 2 to 3 dosimeters need to be used for 2 to 3 measurements. The process is cumbersome, the number of devices is large, and it is not convenient to carry with you. Summary of the invention

[0003] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is: how to provide a detection method that can simultaneously measure α / β / γ / n particles in a mixed field and reduce the number of devices carried.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: A method capable of simultaneously detecting α / β / γ / n rays, obtaining a detector, the detector comprising a shell, a partition plate arranged in the shell to separate the shell into an upper detection layer and a lower detection layer, the shell and the partition plate are made of a material capable of simultaneously shielding α / β rays, a detection port is opened on the shell at a position corresponding to the upper detection layer, a scintillator I capable of detecting α / β rays and a corresponding detection circuit I are installed in the upper detection layer, and a scintillator II capable of detecting γ / n rays and a corresponding detection circuit II are installed in the lower detection layer; The detector is placed in the radiation environment to be detected, and the total response curve of α / β rays is obtained by using scintillator I and detection circuit I. The areas of the prompt part and the delayed part of the two curves are calculated respectively. The ratio of the prompt part to the delayed part is obtained by dividing the area of ​​the prompt part by the area of ​​the delayed part. The signals of α / β rays are distinguished by the size of the ratio, and then the radiation intensity of each α / β ray is detected. The total response curve of γ / n rays is obtained using scintillator II and detection circuit II. The areas of the Prompt part and the Delayed part of the two curves are calculated respectively. The ratio of the Prompt part to the Delayed part is obtained by dividing the area of ​​the Prompt part by the area of ​​the Delayed part. The signal of γ / n rays is distinguished by the size of the ratio, and then the radiation intensity of each γ / n ray is detected.

[0005] In the present invention, the penetrating ability of α / β rays is relatively weak, and the partition can block α / β rays at the same time. Therefore, in the mixed radiation field, α / β rays can only enter the upper detection layer through the detection port but cannot enter the lower detection layer. The penetrating ability of γ / n rays is strong and can penetrate the outer shell into the lower detection layer. Combined with the PSD discrimination algorithm, the α / β / γ / n rays are distinguished by ratio, and the radiation intensity of each ray is detected separately.

[0006] As an optimization, the housing can be detachably connected with a shell cover for shielding the detection port, and the shell cover is made of a material that can shield both α and β rays. When the shell cover is closed, since α and β rays cannot penetrate, but γ and n rays can penetrate, γ and n rays can be detected separately.

[0007] As an optimization, the scintillator I is a scintillator containing a ZnS (Ag) coating, and the scintillator II is a Li plastic scintillator.

[0008] As an optimization, the scintillator containing the ZnS (Ag) coating is in the form of a thin sheet and is arranged facing the direction of the detection port.

[0009] Compared with the prior art, the present invention can realize that one detector can measure α / β / γ / n particles in a mixed field at the same time, which can reduce the load of measurement personnel and make detection more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is the total response curve diagram of γ / n rays in the present invention. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme 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 described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0012] like Figure 1 As shown, in this specific implementation, a method for simultaneously detecting α / β / γ / n rays is provided. Obtain a detector, the detector comprising a shell, a partition is arranged in the shell to separate the shell into an upper detection layer and a lower detection layer, the shell and the partition are made of a material that can shield α / β rays at the same time, a detection port is opened on the shell at a position corresponding to the upper detection layer, a scintillator I capable of detecting α / β rays and a corresponding detection circuit I are installed in the upper detection layer, and a scintillator II capable of detecting γ / n rays and a corresponding detection circuit II are installed in the lower detection layer; The detector is placed in the radiation environment to be detected, and the total response curve of α / β rays is obtained by using scintillator I and detection circuit I. The areas of the prompt part and the delayed part of the two curves are calculated respectively. The ratio of the prompt part to the delayed part is obtained by dividing the area of ​​the prompt part by the area of ​​the delayed part. The signals of α / β rays are distinguished by the size of the ratio, and then the radiation intensity of each α / β ray is detected. The total response curve of γ / n rays is obtained using scintillator II and detection circuit II. The areas of the Prompt part and the Delayed part of the two curves are calculated respectively. The ratio of the Prompt part to the Delayed part is obtained by dividing the area of ​​the Prompt part by the area of ​​the Delayed part. The signal of γ / n rays is distinguished by the size of the ratio, and then the radiation intensity of each γ / n ray is detected.

[0013] In this specific embodiment, a shell cover for shielding the detection port is detachably connected to the outer shell, and the shell cover is made of a material that can shield both α and β rays.

[0014] In this specific implementation, the scintillator I is a scintillator containing a ZnS (Ag) coating, and the scintillator II is a Li plastic scintillator.

[0015] In this specific implementation manner, the ZnS (Ag) coating scintillator is in the form of a thin sheet and is disposed facing the direction of the detection port.

[0016] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Those skilled in the art should understand that those modifications or equivalent substitutions of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution should be included in the scope of the claims of the present invention.

Claims

1. A method capable of simultaneously detecting α / β / γ / n rays, characterized in that: Obtain a detector, the detector comprising a shell, a partition is arranged in the shell to separate the shell into an upper detection layer and a lower detection layer, the shell and the partition are made of a material that can shield α / β rays at the same time, a detection port is opened on the shell at a position corresponding to the upper detection layer, a scintillator I capable of detecting α / β rays and a corresponding detection circuit I are installed in the upper detection layer, and a scintillator II capable of detecting γ / n rays and a corresponding detection circuit II are installed in the lower detection layer; The detector is placed in the radiation environment to be detected, and the total response curve of α / β rays is obtained by using scintillator I and detection circuit I. The areas of the prompt part and the delayed part of the two curves are calculated respectively. The ratio of the prompt part to the delayed part is obtained by dividing the area of ​​the prompt part by the area of ​​the delayed part. The signals of α / β rays are distinguished by the size of the ratio, and then the radiation intensity of each α / β ray is detected. The total response curve of γ / n rays is obtained using scintillator II and detection circuit II. The areas of the Prompt part and the Delayed part of the two curves are calculated respectively. The ratio of the Prompt part to the Delayed part is obtained by dividing the area of ​​the Prompt part by the area of ​​the Delayed part. The signal of γ / n rays is distinguished by the size of the ratio, and then the radiation intensity of each γ / n ray is detected.

2. A method for simultaneously detecting α / β / γ / n rays according to claim 1, characterized in that: The shell is also detachably connected with a shell cover for shielding the detection port, and the shell cover is made of a material that can shield α / β rays at the same time.

3. The method for simultaneously detecting α / β / γ / n rays according to claim 1, characterized in that: The scintillator I is a scintillator containing a ZnS (Ag) coating, and the scintillator II is a Li plastic scintillator.

4. The method for simultaneously detecting α / β / γ / n rays according to claim 3, characterized in that: The scintillator containing the ZnS (Ag) coating is in the shape of a thin sheet and is arranged facing the direction where the detection port is located.

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