一种表面污染监测探测器

Abstract

本实用新型提供了一种表面污染监测探测器，包括探测单元、信号处理单元及主机端；所述探测单元包括遮光薄膜、闪烁光子转换组件及保护层，所述闪烁光子转换组件包括自所述污染监测探测器的外部向内部依次层叠设置的闪烁体、光导结构、硅光电倍增管，所述闪烁体的外表面贴合有所述遮光薄膜,所述遮光薄膜的外侧设有保护层;信号处理单元设置为对硅光电倍增管输出的电信号进行放大和甄别处理；主机端设置为接收处理后的信号并进行污染强度显示和报警；其中，所述闪烁体用于将α或β粒子的辐射能量转换为光信号。本实用新型解决了现有技术中基于GM管的小面积表面污染监测仪存在无法区分辐射种类且易破损的问题。

Claims

1. A surface contamination monitoring probe, characterized in that, include: The detection unit includes a light-shielding film (1), a scintillation photon conversion component (3), and a protective layer (5). The scintillation photon conversion component (3) includes a scintillator (31), a light guide structure (32), and a silicon photomultiplier tube (33) stacked sequentially from the outside to the inside of the pollution monitoring detector. The light-shielding film (1) is attached to the outer surface of the scintillator (31), and the protective layer (5) is provided on the outer side of the light-shielding film (1). The signal processing unit is configured to amplify and distinguish the electrical signal output by the silicon photomultiplier tube (33); The host unit is configured to receive processed electrical signals and display and alarm the pollution intensity. The scintillator (31) is used to convert the radiation energy of α or β particles into light signals.

2. The surface contamination monitor probe of claim 1, wherein, The scintillator (31) is configured as a composite structure comprising a ZnS (Ag) layer (311) and a plastic scintillator layer (312), wherein the ZnS (Ag) layer (311) is sprayed onto the first surface (3121) of the plastic scintillator layer (312) and is used to detect alpha particles.

3. The surface contamination monitor probe of claim 2, wherein, The light guide structure (32) is coupled to the second surface (3122) of the plastic scintillator layer (312) by an optical coupler. The first surface (3121) faces the ZnS(Ag) layer (311) and is used to detect β particles. The photomultiplier tube (33) is coupled to the side of the light guide structure (32) or the side facing away from the plastic scintillator layer by an optical coupler.

4. The surface contamination monitor probe of claim 3, wherein, The thickness of the plastic scintillator layer (312) is 0.5~1mm, and the light guide structure (32) is made of plexiglass (PMMA).

5. The surface contamination monitor probe of claim 1, wherein, The signal processing unit comprises, in sequence, the following: The operational amplifier circuit (6) is configured to amplify the micro-current signal output by the silicon photomultiplier tube (33); The threshold discrimination and pulse shaping circuit (8) is configured to distinguish α and β particle signals by means of an adjustable threshold.

6. The surface contamination monitoring probe of claim 5, wherein, The threshold discrimination and pulse shaping circuit (8) has a dual threshold setting function, wherein the first threshold is set to the signal amplitude corresponding to the α particle and the second threshold is set to the signal amplitude corresponding to the β particle.

7. The surface contamination monitoring probe of claim 1, wherein, It also includes a wireless communication module (9), which is used to transmit the processed electrical signal, and the host terminal includes: A signal interaction module is used to receive the electrical signals sent by the wireless communication module; The microcontroller is configured to calculate the pollution intensity based on the frequency of the electrical signal. The audible and visual alarm is set to trigger an alarm when the pollution intensity exceeds a preset threshold.

8. The surface contamination monitoring probe of claim 7, wherein, The signal interaction module includes a 4G / WiFi module.

9. The surface contamination monitoring probe of claim 1, wherein, The light-shielding film (1) is an aluminum foil film with a thickness of 0.5-2μm, and the protective layer (5) is a PVC board with a thickness of 0.15-0.25mm.

10. The surface contamination monitoring probe of claim 1, wherein, The surface contamination monitoring detector includes a housing (21) with a receiving cavity, a charging connector (22) and a protective sleeve (23). The receiving cavity has a first opening (211) and a second opening (212) connecting the two end faces of the housing (21). The detection unit, the signal processing unit and the host are fixedly installed in the receiving cavity. The charging connector (22) passes through the first opening (211) to seal the opening. The protective layer (5) is installed close to the second opening (212). The protective sleeve (23) covers the second opening (212).

Images