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    • 5. 发明公开
    • Personnel radiation dosimetry device and testing unit
    • 人事量表和Verfahren zur Messung。
    • EP0472762A1
    • 1992-03-04
    • EP90116595.1
    • 1990-08-29
    • RADON TESTING CORPORATION OF AMERICA
    • Doughty, Kevin
    • G01T1/14
    • G01T1/14
    • A system for measuring the cumulative amount of radiation received by a person includes a radiation monitoring electret (13). This electret (13) is supported on a first conductive plate and preferably is positioned within a protective cavity such that it is not discharged by non-radiation sources. Measurement of the charge decrease on the electret over time is achieved by a null method. In particular, a second plate (11) in the monitoring device is located over the electret, or the electret itself, is vibrated and an A.C. amplitude modulation detector (16) produces an output signal created by the alternating electric field due to the vibration. A D.C. voltage of opposite charge is then applied to the first conducting plate on which the electret is supported. This field is increased until it cancels the A.C. field above the electret. When this null occurs, the applied D.C. voltage is equal to the charge on the electret. Using this null technique the electret charge can be accurately measured without contacting the electret.
    • 用于测量由人接收的辐射累积量的系统包括辐射监测驻极体(13)。 该驻极体(13)被支撑在第一导电板上,优选地位于保护腔内,使得其不被非辐射源排出。 随着时间的推移,驻极体电荷减少的测量是通过零法实现的。 特别地,监视装置中的第二板(11)位于驻极体的上方,或驻极体本身被振动,并且交调幅度调制检测器(16)由于振动而产生由交变电场产生的输出信号。 然后将相反电荷的直流电压施加到其上支撑驻极体的第一导电板。 该字段增加,直到它取消驻极体上方的交流电场。 当该零点发生时,施加的直流电压等于驻极体上的电荷。 使用这种零技术,可以在不接触驻极体的情况下精确测量驻极体电荷。