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首页> 外文会议>IEEE Nuclear Science Symposium and Medical Imaging Conference >Results and potential applications of handheld, midsized, and large-area low-cost Li foil MWPCS
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Results and potential applications of handheld, midsized, and large-area low-cost Li foil MWPCS

机译：手持，中型和大面积低成本Li箔MWPCS的结果和潜在应用

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Three different sizes of Li foil multi-wire proportional counter (MWPC) neutron detectors were constructed with effective areas ranging between 30-1250 cm. These Li foil MWPC neutron detectors contain five 75 μm thick suspended Li foils. Each foil is less than the summed range (156 μm) of the triton and alpha particle reaction products from the Li(n,α)H reaction. Suspending Li foils offers several advantages over conventional coated gas-filled devices, such as increased detection efficiency and gamma-ray rejection capabilities. Improvements are a direct result of the reaction products simultaneously escaping both sides of suspended Li foils. The three categories of detectors constructed (large-area, mid-sized, handheld) were tested against He neutron detectors. Two large-area detectors (1250 cm effective area) were position back-to-back in HDPE housing. Various tests were completed with this large-area unit including: 1/R, transient, field-of-view, and angular response. A mid-sized detector (550 cm) was delivered to a backpack test campaign where the device outperformed two commercially available He tube backpack detectors. Both the large-area and mid-sized Li foil MWPCs had measured intrinsic thermal neutron detection efficiencies of 54% and a gamma-ray rejection ratio (GRR) of 3.0 × 10 or better. Lastly, several handheld sized devices were constructed and compared to a 4 atm He tube (ε = 81.5%). A smaller version of the five layer devices was constructed (effective area: 30 cm). This five layer device and another device, referred to as the `5-layer mini' and `Quad', had comparable count rates to the He detector.
机译：构造了三种不同尺寸的锂箔多线比例计数器（MWPC）中子探测器，有效面积在30至1250厘米之间。这些Li箔MWPC中子探测器包含5个75μm厚的悬浮Li箔。每个箔小于Li（n，α）H反应的the核和α粒子反应产物的总和（156μm）。与传统的带涂层的充气设备相比，悬挂式锂箔具有多个优势，例如提高了检测效率和伽马射线抑制能力。改进是反应产物同时逸出悬浮的Li箔两面的直接结果。针对氦中子探测器对构造的三类探测器（大面积，中型，手持式）进行了测试。两个大面积探测器（有效面积1250厘米）背对背放置在HDPE外壳中。使用该大面积单元完成了各种测试，包括：1 / R，瞬态，视野和角度响应。一个中型检测器（550厘米）被交付给背包测试活动，该设备的性能优于两个市售的He管背包检测器。大面积和中型Li箔MWPC的固有热中子探测效率均为54％，γ射线排斥比（GRR）为3.0×10或更高。最后，构造了几种手持设备大小的设备，并将其与4 atm He管（ε= 81.5％）进行了比较。构建了五层设备的较小版本（有效面积：30厘米）。该五层设备和另一个设备（称为“ 5层微型”和“四合一”）具有与He检测器相当的计数率。

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