In a photosensor system formed of a photosensor array including a plurality of photosensors arranged in a two dimensional direction, the intervals of the reset pulse, read pulse and pre-charge pulse applied to each row of the photosensor array are respectively set equal to the sum of the reset period, the read period, and the pre-charge period. A combination of the solvent resistant label and container also constitutes part of this invention. The medical device in inserted into the bag through the absorbent material.