PURPOSE: To contrive automatic discrimination between pieces of shells and shucked shellfishes, by measuring intensity and wave form of an absorption part and absorption width of an absorption signal in an X-ray image and discriminating the X-ray absorption parts due to the pieces of the shell and shucked shellfishes based on the measured values.
CONSTITUTION: X-rays are irradiated to shucked shellfishes 14 in the respective buckets 24 on a bucket conveyor 18 in an X-ray irradiator 32. An X-ray image of the shucked shellfishes 14 is received by an X-fluorescent plate 36 emitting light by sensitizing to the X-rays of a receptor having the fluorescent plate 36. Further, the light emitted from the fluorescent plate 36 is converted into an electric signal by a photoelectric transfer element 38. The electric signal of the photoelectric transfer element 38 is amplified to a prescribed level in a signal processor 40 and then subjected to logarithmic conversion to measure the intensity, width and absorption wave form of an X-ray image absorption part of the above-mentioned transferred image signal. Thereby, X-ray image absorption parts of the shucked shellfishes and pieces of shells are discriminated based on the afore-mentioned measured values. Furthermore, a control signal is taken from the processor 40 in a selector 59 to operate the bucket 24 and remove the shucked shellfishes containing pieces of shells.
FUKUZAWA KUNIYUKI
KOIDE HIDEO
MATSUMOTO ATSUYUKI
YAMADERA TOSHIO
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