| 摘要 |
An apparatus for determining the specific weight of selected regions of microscopic small, for instance of a size between about 5 mu m to 1 mm, approximately plane parallel samples by means of a substantially punctual radiation source for gamma or X-rays, containing a first collimator, an observation device provided with incident light illumination, a sample stage having a sample carrier and a standard for the specific weight being movable perpendicular to the axis of the beam of the punctual radiation source, and a radiation measuring device for determination the absorption of radiation. There is provided a second collimator having a smaller opening than the first collimator, and as radiation measuring device there is provided a measuring probe and a count-rate measuring device for a predetermined wavelength.
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