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    Radiation detection system with automatic sample counting rate determination
    6.
    发明授权
    Radiation detection system with automatic sample counting rate determination 失效
    具有自动样品计数速率测定的辐射检测系统

    公开(公告)号：US3578960A

    公开(公告)日：1971-05-18

    申请号：US3578960D

    申请日：1966-04-06

    Applicant: BECKMAN INSTRUMENTS INC

    Inventor： GEORGI HEINZ W ,  NATHER ROY E

    IPC: G01T1/16 ,  G06F7/498 ,  G06F7/52 ,  G06F7/39

    CPC classification number: G06F7/4985 ,  G01T1/16

    Abstract: A radiation detection system with automatic and continuous online computation of sample count rate is disclosed. Logic circuitry is provided by which count pulses are added to a X register and subtracted from a dividend register. A comparator circuit is provided to detect the condition of identical tally in the X register and a timer register. Upon comparison and tally coincidence of the X register with the timer register, a means to increment a quotient register is provided. Such incrementation is continued until the dividend register is reduced to zero as indicated by the negative detection circuit provided therefor. The quotient register thereby contains the number of times the timer register can be divided into the dividend register. Other circuitry is provided to transfer the counts from a sample radiation detector into the dividend register. Therefore, at the end of computation the quotient register contains the sample count rate desired. Further logic circuitry and a cycle phase counter circuit are provided to accomplish division in a time substantially less than the elapsed measurement time period. By this logic means the various registers are incremented or decremented, as the case may be, at higher decade levels in the register progressing to lower decade levels as the logic circuitry and cycle phase counter direct, thereby providing a short computational time approaching a continuous presentation of sample count rate. Automatic compensation for undesired background counts is provided by means of digital circuits for subtraction of such count from the quotient register.

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