Corrections to photocount distributions due to dead-thne effects are evaluated by the use of a new pulse-plleup model Incorporating a paralyzable portion and nonparalyzable component In sequence. In the simple model, the two dead times are regarded as nonvarying. A more complete model Is presented In the Appendix, which Incorporates dead times that are themselves random variables.1121 amplifier discriminator and a Model 1109 photon counter) and suggest that the counting system can be considered to be composed of four simplified parts: a detector (including the diode string), an amplifier discriminator, a pulse shaper (within the amplifier discriminator), and a counter. We propose that the detector and amplifier discriminator are both paralyzable systems and can be represented by a single rate-limiting paralyzable counting mechanism. The pulse shaper and counter have electronic components that are nonparalyzable and slower than the previous circuits. They can be represented by a single, rate-limiting nonparalyzable mechanism. The pulse-pileup effects can then be derived for the two sequential systems, each with its own dead time (see also ref 6).
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