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文章叙述钚处理设备物料滞留量监测仪的研制及其有关设备中和管道内钚的总α放射性的测量方法。监测仪硬件主要包括：可携式平面型ＨＰＧｅ探测器；φ５０ｍｍ×６０ｍｍＮａＩ（Ｔ１）探测器，可调γ射线束准直系统；ＯＲＴＥＣ９２Ｘ－Ｗ＿２能谱控制系统和ＡＳＴ－２８６计算机。软件主要包括Ｍａｅ－ｓｔｒｏ￣（ＴＭ）ｆｏｒＷｉｎｄｏｗ３和ＰＨＯＵＰ１滞留量用户软件。采用ＭＣＮＰ软件对复杂设备内钚源项γ射线到达设备外测量点的几率进行蒙特卡罗计算。采用多位置测量数据平均的方法来减小源项分布不均匀性的影响。在长寿命裂变产物γ剂量场为０．８×１０￣（－１０）Ｃ／ｋｇ·ｓ的环境下，监测仪对附着在３－８ｍｍ厚钢板上的模拟钚源的α放射性探测灵敏度好于３．７×１０￣６Ｂｑ／ｋｇ（钢板）。
The article describes the plutonium processing equipment material retention monitoring instrument developed and its related equipment and pipeline plutonium in the total alpha radioactivity measurement method. Monitor hardware includes: portable planar HPGe detector; φ50mm × 60mmNaI (T1) detector, adjustable γ-ray beam collimation system; ORTEC92X-W_2 spectrum control system and AST-286 computer. Software mainly includes Mae-stro (TM) forWindow3 and PHOUP1 stranded user software. The MCNP software was used to calculate Monte Carlo odds of the γ ray reaching the measurement point outside the equipment in the plutonium source in the complex equipment. The average of multi-location measurement data is used to reduce the influence of nonuniform distribution of source items. In the environment where the γ-dose field of the long-lived fission product is 0.8 × 10 -10 C / kg · s, the detector has a better α-ray detection sensitivity for the simulated plutonium source attached to the 3-8 mm thick steel plate 3.7 × 10 ~ 6Bq / kg (steel plate).