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首页> 外文期刊>Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine >Measurement of beta surface emission rate from an extended area Cl-36 source using a multiwire proportional counter
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Measurement of beta surface emission rate from an extended area Cl-36 source using a multiwire proportional counter

机译：使用多线比例计数器测量来自广域Cl-36源的β表面发射率

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We have developed, as a national standard, a windowless multiwire proportional counting (MWPC) system for gross measurements of alpha- and beta-emitting radionuclides at an uncertainty level below 1%. Various detector characteristics have been studied and several working parameters of the system have been determined in order to achieve an optimized detection capability. The detector is commissioned through an international comparison of the beta emission rate from an extended area Cl-36 source. Correction for the dead time loss is made by the non-extendable dead time method. A linear extrapolation of pulse height spectrum is employed to correct for the loss in the detection efficiency due to discriminating against the events formed from a small number of original ion pairs. The surface emission rate was measured to be 1.84 x 10(3) counts/s with the relative combined standard uncertainty of 0.46%. The measured uncertainty indicates that the constructed MWPC is capable of serving as a national standard. (c) 2005 Elsevier Ltd. All rights reserved.
机译：作为国家标准，我们开发了无窗口多线比例计数（MWPC）系统，用于总测量发射α和β的放射性核素，其不确定度低于1％。已经研究了各种检测器特性，并确定了系统的几个工作参数，以实现优化的检测能力。该探测器是通过对来自广域Cl-36光源的β发射率进行国际比较而委托调试的。死区时间损失的校正是通过不可扩展的死区时间方法进行的。使用脉冲高度谱的线性外推法来校正由于区分由少量原始离子对形成的事件而导致的检测效率损失。测得的表面发射速率为1.84 x 10（3）counts / s，相对组合标准不确定度为0.46％。测得的不确定性表明所构建的MWPC可以用作国家标准。 （c）2005 Elsevier Ltd.保留所有权利。

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