Radiant energy – Inspection of solids or liquids by charged particles – Analyte supports
Patent
1975-11-28
1977-10-04
Church, Craig E.
Radiant energy
Inspection of solids or liquids by charged particles
Analyte supports
250416R, G01N 2308
Patent
active
040526208
ABSTRACT:
An improved radiation measuring and processing unit for a radiation scanning system precisely determines the average intensity of a beam of radiation as it impinges upon a radiation detector during a primary time period of predetermined duration. The unit computes the average intensity by detecting the average rate of a train of intensity representing pulses occurring during a secondary time period whose duration is determined according to the occurrences of the pulses within the primary time period. The system is preferably a transverse section, X-ray scanning system, and the radiation detector generates a data signal having a level indicative of the intensity of the beam of X-radiation after it passes through a subject. The measuring and processing unit includes a pulse generator, preferably in the form of a charge pump integrator, for converting the data signals into the train of data pulses having a repetition rate which varies according to the level of the data signal. The unit also includes a data counter and a time counter which are operative throughout a series of the primary time periods. The time counter counts a series of clock pulses indicative of the lapse of time between the first and last data pulses occurring during the primary time period, thereby establishing the secondary time period. The data counter counts all pulses occurring during the secondary time period, i.e., the second and subsequent data pulses occurring during the primary time period. Comparison of the contents of the data and time counters at the end of the primary time period provides an accurate indication of the average intensity of the X-ray beam as it impinges upon the detector.
REFERENCES:
patent: 2745019 (1956-05-01), Hamacher
patent: 3573461 (1971-04-01), Ohlsson
patent: 3714429 (1973-01-01), McAfee et al.
patent: 3778614 (1973-12-01), Hounsfield
Anderson B. C.
Church Craig E.
Picker Corporation
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