CN202404239U - 嵌入式放射性液体比活度探测装置 - Google Patents
嵌入式放射性液体比活度探测装置 Download PDFInfo
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- CN202404239U CN202404239U CN 201120519008 CN201120519008U CN202404239U CN 202404239 U CN202404239 U CN 202404239U CN 201120519008 CN201120519008 CN 201120519008 CN 201120519008 U CN201120519008 U CN 201120519008U CN 202404239 U CN202404239 U CN 202404239U
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- 238000005259 measurement Methods 0.000 claims abstract description 24
- 239000000523 sample Substances 0.000 claims abstract description 23
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- 229910001220 stainless steel Inorganic materials 0.000 description 1
Abstract
本实用新型涉及核辐射探测技术领域，提供一种嵌入式放射性液体比活度探测装置，包括测量管路、探头和铅屏蔽体，所述测量管路为偏心变径结构，探头前端插入测量管路中部，测量管路和探头外部包裹铅屏蔽体。本实用新型将一段测量管路嵌入排出流管道中，并将探头伸入测量管路内部对液体比活度进行直接测量，其结构简单，维护方便、响应迅速、探测效率高，且能保证测量范围满足环境监管部门对内陆核电站排出流监测提出的要求。
Description
嵌入式放射性液体比活度探测装置
技术领域
[0001] 本实用新型涉及核辐射探測技术领域，具体的说是ー种嵌入式放射性液体比活度探測装置，用于核电站或其他核设施液态排出流放射性比活度的连续监測。
背景技术
[0002] 碘化纳闪烁体探測器在核辐射监测领域有着广泛的应用。探測装置主要由碘化纳闪烁体、光电倍增管、前置放大电路、主放大电路、地处理与显示单元及信号输出单元组成。根据不同的监测目的，还需要配套相应的设备组件，如铅屏蔽室、流量计、隔热层、泵等。当Y射线入射碘化纳闪烁体时，碘化纳闪烁体就会发光，光电倍增管将收集到的闪烁光转换成电信号并放大输出，经电子学系统放大处理后输出给上位机进行记录。
[0003]目前核电站普遍采用的液体活度探测装置为离线取样式（Off-Line)液体比活度探測装置，该类探測装置采用取样方式，先将液体通过专用管路取样到探測装置的液体取样罐中，然后对放射性液体比活度进行測量。其优点是，探測装置的探測效率较高、受外部Y本底场干扰小，能測量到低比活度的液态排出流，測量结果精度高。其缺点是，探測装置需配套取样管路及阀泵等设备，系统结构复杂、维护困难；同时因为被测对象流动到探測装置需要一段时间，仪器响应缓慢。因此，在国内新建的核电站中离线取样式（Off-Line)探测装置正逐渐被在线式（On-Line )液体比活度探測装置取代。
[0004] 在线式（On-Line)液体比活度探测装置，将探测装置布置在液态排出流的管道外，探测对准管道对液体比活度进行直接測量。该探测装置的优点是，測量不需要介入排出流管道系统，探測装置结构简单，维护简单，仪器相应时间快。其缺点是，探測装置的探测效率较低、受外部Y本底场干扰大，无法測量到低比活度的液态排出流，測量结果精度低；同时当排出流的管道受放射性物质沾染时，无法通过更换測量段管道的方法进行彻底去污，导致測量下限随时间推移而增加。
发明内容
[0005] 本实用新型的目的就是为了克服上述现有技术的不足之处，而提供ー种嵌入式(In-Line)放射性液体比活度探測装置，其结构简单，维护方便、响应迅速、探测效率高，且能保证测量范围满足环境监管部门对内陆核电站排出流监测提出的要求。
[0006] 本实用新型的目的是通过如下技术措施来实现的：嵌入式放射性液体比活度探測装置，包括測量管路、探头和铅屏蔽体，所述测量管路为偏心变径结构，探头前端插入测量管路中部，測量管路和探头外部包裹铅屏蔽体。
[0007] 在上述技术方案中，所述测量管路采用偏心变径结构，在測量管路出水、入水ロ进行了偏心和缩径，測量管路中部设有待探头插入的内陷圆筒结构。
[0008] 在上述技术方案中，所述探头包括内嵌有稳峰源的碘化纳闪烁体、光电倍增管、分压器和前置放大电路，整个探头组件安装在ー个铝合金加工而成的圆柱形避光、防水壳体内。[0009] 在上述技术方案中，所述铅屏蔽体采用合金铅加工而成，厚度> 80mm。
[0010] 本实用新型提出了ー种嵌入式（In-Line)放射性液体比活度探測装置，将一段测量管路嵌入排出流管道中，并将探头伸入測量管路内部对液体比活度进行直接測量。该探测装置结构简单、维护方便、响应迅速、探测效率高，可以在2. 5μ Sv/h (等效6tlCo能量）的环境本底条件下实现3. 7X IO3BqAi3的最小可探测活度，測量范围达到3. 7X 103Bq/m3〜3. 7X 109Bq/m3，满足核电站液态排出流监测需要。 附图说明
[0011] 图I为本实用新型嵌入式放射性液体比活度探測装置的结构示意图。
[0012] 其中：1.探头，2.測量管路，3.铅屏蔽体。
具体实施方式
[0013] 下面结合附图及实施例对本实用新型作进ー步的描述。
[0014] 如图I所示，本实施例中嵌入式放射性液体比活度探測装置，包括測量管路2、探头I和铅屏蔽体3，所述测量管路2为偏心变径结构，探头I前端插入测量管路2中部，測量管路2和探头I外部包裹铅屏蔽体3。所述输出的探測信号传输到就地处理与显示单元进行处理并得到待测管道液体放射性比活度。
[0015] 为了适应较强辐射本底环境下的正常工作，将测量管路2设计成偏心变径结构，在測量管路出水、入水ロ进行了偏心和缩径，便于铅屏蔽体3进行封装。測量管路2中部还设有待探头I插入的内陷圆筒结构，使探头I在插入测量管路2内部时不会直接接触液体。所述测量管路2采用不锈钢加工而成，焊缝打磨，内壁抛光。
[0016] 所述探头I包括内嵌有稳峰源的碘化纳闪烁体、光电倍增管、分压器和前置放大电路，整个探头组件安装在ー个铝合金加工而成的圆柱形避光、防水壳体内，通过电连接器及电缆将測量信号输出。探測信号脉冲高度经前置放大电路放大后可达到200mV〜3V。
[0017] 所述铅屏蔽体3采用合金铅加工而成,厚度彡80mm。
[0018] 本实施例在使用吋，首先将测量管路2连接到核电站或其他核设施工艺管道中，再将探头I安装进测量管路2的内陷圆筒中，最后用铅屏蔽体3将测量管路2和探头I包裹屏蔽。当核电厂液态排出流流经测量管路2时，探头I就会对管路中液体放射性进行连续监測。根据实际工作需要，设置报警阈值，当液体放射性比活度超过限值时，发出声光报警功能，并连锁触发电磁截止阀截止エ艺管道对放射性液体的排放，仪器同时将这些信号传送出去可在远端上位机查看测量结果及报警状态。实施例中在測量管路2的出水、入水ロ进行了偏心和缩径，同时加设铅屏蔽体3很好的屏蔽环境本底对探头的直接照射，因此可以在保证探测效率的基础上，有效降低环境本底对探测装置的影响。
[0019] 本实施例中探头可以伸入測量管路60_，測量管路2容积为10. 6L，在进行标定探测效率时，可以通过调节探头I伸入測量管路深度对探测效率进行适当调整。
Claims (4)
1.嵌入式放射性液体比活度探測装置，包括測量管路、探头和铅屏蔽体，其特征是：所述测量管路为偏心变径结构，探头前端插入测量管路中部，測量管路和探头外部包裹铅屏蔽体。
2.根据权利要求I所述的嵌入式放射性液体比活度探測装置，其特征是：所述测量管路采用偏心变径结构，在測量管路出水、入水ロ进行偏心和缩径，測量管路中部设有待探头插入的内陷圆筒结构。
3.根据权利要求I所述的嵌入式放射性液体比活度探測装置，其特征是：所述探头包括内嵌有稳峰源的碘化纳闪烁体、光电倍增管、分压器和前置放大电路，整个探头组件安装在ー个招合金加工而成的圆柱形避光、防水壳体内。
4.根据权利要求I所述的嵌入式放射性液体比活度探測装置，其特征是：所述铅屏蔽体采用合金铅加工而成，厚度> 80mm。
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998317A (zh) * | 2012-11-26 | 2013-03-27 | 中国工程物理研究院核物理与化学研究所 | 双路放射性液体连续自动测量系统 |
| CN105115993A (zh) * | 2015-09-18 | 2015-12-02 | 核工业理化工程研究院 | 溶液中铀浓度在线测量装置 |
| WO2021022955A1 (zh) * | 2019-08-06 | 2021-02-11 | 苏州瑞派宁科技有限公司 | 一种辐射探测装置 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998317A (zh) * | 2012-11-26 | 2013-03-27 | 中国工程物理研究院核物理与化学研究所 | 双路放射性液体连续自动测量系统 |
| CN105115993A (zh) * | 2015-09-18 | 2015-12-02 | 核工业理化工程研究院 | 溶液中铀浓度在线测量装置 |
| WO2021022955A1 (zh) * | 2019-08-06 | 2021-02-11 | 苏州瑞派宁科技有限公司 | 一种辐射探测装置 |
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