| 摘要 |
A plastic scintillator element that is tissue equivalent is optically coupled to a photomultiplier tube that provides a pulse signal which contains information relating to radiation energy fluence, and having an undesirable "dark current" component. A direct current blocking element in the form of a capacitor isolates the input of an operational amplifier from the "dark current" component so that the output signal of the amplifier indicates the average current of the photomultiplier signal attributed only to detected, low level, environmental radiation in the range of 0-200 mu rem/h.
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