| 摘要 |
1,202,467. Determining the position of an ionizing event. UNITED STATES ATOMIC ENERGY COMMISSION. Sept.27, 1968 [Nov.3, 1967], No.46149/68. Heading G1A. In an arrangement for indicating the position of an event along the collector of an ionizing radiation detecting element the collector is of sufficient resistance per unit length to provide a voltage pulse at its output end whose rise time is proportional to the distance between the position of the event and the output end of the collector, the voltage pulse is applied to shaping circuitry to provide two time differing bi-polar pulses of at least two half-cycles and having a time difference proportional to the rise time of the voltage pulse from the collector, and the time difference of these bi-polar pulses is detected and recorded to indicate the position. The detector may be a gas filled tube having a fused graphite coated quartz fibre collector or a surface barrier diode having an elongated semi-conductor body of an N-type material and a thin collector of P-type material. The shaping circuitry may comprise two parallel circuits differentiatorintegrator-differentiator in whichthe time constants are different, or a tapped chain, differentiatorintegrator-differentiator-differentiator, and the timing of the crossover points may be detected. Times and resistance values are exemplified and use of the arrangement in nuclear diffraction is referred to. |
