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    • 4. 发明授权
    • Prompt gamma neutron activation analysis system
    • 快速伽马中子激活分析系统
    • US5539788A
    • 1996-07-23
    • US958215
    • 1992-10-08
    • Frank H. RuddyThomas V. CongedoDavid C. GrantEdward J. LahodaJoseph L. GonzalezJohn G. SeidelJohn BartkoDavid F. McLaughlin
    • Frank H. RuddyThomas V. CongedoDavid C. GrantEdward J. LahodaJoseph L. GonzalezJohn G. SeidelJohn BartkoDavid F. McLaughlin
    • G01N23/222G01V5/02G21G1/06
    • G01V5/02G01N23/222G01N2223/0745G01N2223/204G01N2223/601
    • A system for determining depth profiles of concentrations of hazardous elements in soils comprises a neutron source for generating neutrons of a first energy level and irradiating a volume of soil with the neutrons. Nuclear reactions are effected within the soil and gamma radiation is emitted from the soil. The system also includes an array of gamma detectors for detecting gamma radiation emitted from the soil; source electronics for controlling the width of regularly repeated pulses of neutrons generated by the neutron source; detector electronics associated with the gamma detectors for amplifying and digitalizing signals generated by the gamma detectors and storing data representing the digitalized signals; spectral analysis software for analyzing the data and determining the concentrations of selected target elements in the soil; and an acquisition interface module (AIM). The AIM controls the timing of the source and detector electronics such that the neutron source generates neutrons in regularly repeated bursts of a prescribed pulse width and the detectors and detector electronics detect gamma rays during a plurality of time intervals associated with the burst and acquire groups of data. Each group is indicative of a number of gamma rays emitted and their energy levels during a corresponding time interval. The system also includes a mobile platform carrying the neutron source, array of gamma ray detectors and software for determining a depth profile of a target element. Trace elements can also be detected with the disclosed system.
    • 用于确定土壤中有害元素浓度深度分布的系统包括用于产生第一能级中子并用中子照射一定体积土壤的中子源。 核反应在土壤中进行,γ辐射从土壤中排出。 该系统还包括用于检测从土壤发射的γ辐射的伽马检测器阵列; 源电子器件,用于控制由中子源产生的规则重复的中子脉冲的宽度; 与γ检测器相关联的检测器电子器件,用于放大和数字化由伽马检测器产生的信号并存储表示数字化信号的数据; 光谱分析软件,用于分析数据并确定土壤中选定的目标元素的浓度; 和采集接口模块(AIM)。 AIM控制源和检测器电子设备的定时,使得中子源以规定的脉冲宽度的规则重复脉冲串产生中子,并且检测器和检测器电子装置在与突发相关联的多个时间间隔内检测伽马射线,并获取 数据。 每个组指示在相应的时间间隔期间发射的伽马射线数量及其能量水平。 该系统还包括携带中子源,伽马射线探测器阵列和用于确定目标元件的深度分布的软件的移动平台。 也可以利用所公开的系统检测微量元素。
    • 8. 发明授权
    • Radiation dosimeter assembly
    • 辐射剂量计组件
    • US4220852A
    • 1980-09-02
    • US941995
    • 1978-09-13
    • John G. Seidel
    • John G. Seidel
    • G01T1/11G01V5/02G01V5/00H05B33/00
    • G01V5/02G01T1/11Y10S250/02
    • In a radiation dosimeter assembly consisting of a wafer-like radiation dosimeter in combination with a mechanical support member the radiation dosimeter is secured within an aperture of the support member by disposing a protective film on either side of the dosimeter and securing the film to the support member via a high temperature adhesive or high temperature adhesive film. This assembly technique permits the annealing of the combination of the dosimeter and the support member to a temperature of about 300.degree. C. which is the typical process for "erasing" extraneous radiation dosage stored in the dosimeter prior to the use of the radiation dosimeter/support combination for radiation measurements. The capability of annealing the total combination permits stock piling of preassembled radiation dosimeter/support member combinations for extended periods of time.
    • 在由晶片状放射剂量计与机械支撑构件组合的放射剂量计组件中,辐射剂量计通过在剂量计的任一侧上设置保护膜并将膜固定到支撑体上而固定在支撑构件的孔内 通过高温粘合剂或高温粘合剂膜。 该装配技术允许将剂量计和支撑构件的组合退火至约300℃的温度,这是在使用放射剂量计/分析仪之前“擦除”存储在剂量计中的外来辐射剂量的典型过程, 支持辐射测量的组合。 整个组合退火的能力允许预先组装的辐射剂量计/支撑构件组合在较长时间内堆积。