Abstract: An apparatus for measuring the Sulfur component contained in oil includes an X-ray tube having a target made of Titanium or Scandium, a filter made of Titanium or Scandium for filtering said X-ray radiated from the X-ray tube, a measurement cell for introducing a sample to be measured therein, and a detector for detecting fluorescent X-rays radiated from the sample. According to the invention, the X-ray tube has a target made of Titanium or Scandium and the X-rays generated from the X-ray tube are filtered by the filter, which is made of Titanium or Scandium, so that the background of the X-rays for the measurement against the fluorescent X-rays of the Sulfur is reduced and therefore even a small amount of Sulfur contained in the sample can be correctly detected.

Abstract: An epitaxial integrated E-dE solid state detector telescope comprising a dE detector produced on an epitaxial layer and a E detector produced on a high purity silicon layer, both of which are fabricated on a single silicon wafer having N-N.sup.+ -N type complex structure. Said dE and E detectors are electrically isolated by a very low resistive N.sup.+ type silicon layer, which is produced on the high purity N type silicon substrate by impurity diffusion technique and is buried under the epitaxial silicon layer. Electrodes of dE and E detectors are produced on both sides of the silicon wafer by means of evaporation of gold in a vacuum. Said electrodes are reverse biased and depletion layers which act as active regions of dE and E detectors are extended from outsides toward said buried layer, providing independent charge collections of carries produced by incident charged particles in dE and E detectors by said electrodes.