Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 663
radiumamount to 163 cubic millimetres of helium per year, so the amountof hydrogen liberated cannot be more than i/iooo of a cubicmillimetre per year. Thus the amount of hydrogen liberated inany practicable experiment is not detectable by ordinary chemicalmethods, but the disintegration may be… … Apparatus for the scintillation method. diameter, provided with stopcocks which permit the circulation ofdry gases. At the end toward the microscope is a hole coveredwith a very thin silver foil. The zinc sulphide screen, S, is put 1.3mm. away from the hole in order to leave room for the…
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