CIRCUITRY AND CIRCUIT ELEMENTS Radiation DetectorswhereSUR = startup rate in decades per minute26.06 = constantt= reactor period in secondsThe reactor operator adjusts control rods so that an upper limit, such as 1 DPM, is notexceeded. This allows an orderly increase in reactor power.SummaryThe source range uses a proportional counter. The intermediate range uses a compensated ionchamber. The power range uses an uncompensated ion chamber. Terms used to describe theelectrical circuits are summarized below.Circuit Terminology SummarySignal-to-noise ratio is the ratio of the electrical output signal to the electricalnoise generated.A discriminator selects the minimum pulse height to be counted.Analog is a mechanism in which data is represented by continuously variablephysical quantities.Logarithm is the exponent that indicates the power to which a number is raisedto produce a given number.Reactor period is that amount of time required for neutron flux to change by afactor of e.Decades per minute is the rate at which neutron flux is changing by a power of10 in each minute.Scalar is a measurement or quantity which is capable of being represented on ascale.Startup rate is the rate at which neutron flux is changing measured in decades perminute.IC-06 Page 62 Rev. 0
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