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基于波移光纤及硅光电倍增管的钚气溶胶测量系统

夏文友 郝樊华 吴健

夏文友, 郝樊华, 吴健. 基于波移光纤及硅光电倍增管的钚气溶胶测量系统[J]. 强激光与粒子束. doi: 10.11884/HPLPB202234.220101
引用本文: 夏文友, 郝樊华, 吴健. 基于波移光纤及硅光电倍增管的钚气溶胶测量系统[J]. 强激光与粒子束. doi: 10.11884/HPLPB202234.220101
Xia Wenyou, Hao Fanhua, Wu Jian. Plutonium aerosol measurement system based on wavelength shift fiber and silicon photomultiplier[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202234.220101
Citation: Xia Wenyou, Hao Fanhua, Wu Jian. Plutonium aerosol measurement system based on wavelength shift fiber and silicon photomultiplier[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202234.220101

基于波移光纤及硅光电倍增管的钚气溶胶测量系统

doi: 10.11884/HPLPB202234.220101
详细信息
    作者简介:

    夏文友,706969241@qq.com

  • 中图分类号: TL812+.1

Plutonium aerosol measurement system based on wavelength shift fiber and silicon photomultiplier

  • 摘要: 钚气溶胶测量是进行钚材料相关实验研究的基础。为了确保辐射安全,常需将钚材料密封于密闭容器内以实现对钚气溶胶的包容,商用钚气溶胶监测设备由于难以放入含钚密闭容器而不适用于该应用场景下钚气溶胶浓度的监测。使用ZnS(Ag)闪烁体作为辐射灵敏材料放置于含钚密闭容器内,通过波移光纤将闪烁体信号引出密闭容器,并通过硅光电倍增管实现对闪烁体信号的采集,使用该技术路线建立的钚气溶胶测量系统能够用于密闭容器内钚气溶胶的测量。该测量系统可根据具体需求实现对探测器尺寸、形状的定制,具有功耗低,结构相对简单等优点,实现了密闭容器内钚气溶胶的远程就地测量,具备n/γ混合辐射场下α粒子甄别测量能力。
  • 图  1  钚气溶胶测量系统示意图

    Figure  1.  Schematic diagram of the plutonium aerosol measurement system

    图  2  ZnS(Ag)探测器测量几何模型

    Figure  2.  Measurement geometry of ZnS(Ag) detector

    图  3  模拟获得的α和γ射线在ZnS(Ag)探测器中的能量沉积谱

    Figure  3.  Energy spectra of ZnS(Ag) detector

    图  4  探测器探测效率随阈值的变化关系

    Figure  4.  Relationship between detection efficiency and threshold

    图  5  探测器探测效率随ZnS(Ag)灵敏面积的变化关系

    Figure  5.  Relationship between detection efficiency and sensitive area of ZnS(Ag)

    图  6  探测器探测效率随狭层腔体厚度的变化关系

    Figure  6.  Relationship between detection efficiency and thickness of narrow chamber

    图  7  不同质量厚度ZnS(Ag)闪烁体源响应能谱

    Figure  7.  Reference response spectra of ZnS(Ag) scintillator with different mass thickness

    图  8  能峰计数率及能峰峰位与ZnS(Ag)涂层质量厚度关系

    Figure  8.  Relationship between counting rate/peak position of full-energy peak with ZnS(Ag)’s mass thickness

    图  9  α粒子响应谱与其他不同响应谱的叠加能谱

    Figure  9.  Compostion of α particle reference response spectra with other different response spectra

    表  2  ZnS(Ag)闪烁体源响应测试结果

    Table  2.   Test results of ZnS(Ag) detector’s reference response

    No.mass thickness of
    ZnS(Ag)/(mg·cm−2)
    characteristic of
    spectrum
    counting rate of
    α spectrum/s−1
    peak position of α
    spectrum channel
    13.75α peak overlapped with background noise69.36124.88
    26.53α peak overlapped with background noise132.50124.53
    37.62visible distinction316.02138.12
    414.69visible distinction396.75150.66
    526.85visible distinction463.48164.50
    662.85visible distinction478.95172.34
    7123.95visible distinction499.39183.86
    下载: 导出CSV

    表  1  典型情况下测量系统理论探测限

    Table  1.   Theoretical detection limits of the measurement system

    measurement time/mindetection limit/(Bq·m−3)
    12900
    10330
    30134
    6081
    48023
    144013
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-04-08
  • 修回日期:  2022-07-20
  • 网络出版日期:  2022-07-25

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