The Kα/Kβ intensity ratio of Mn KX-rays scattered by metallic samples changed remarkably with the geometry between the sample and the55Fe source-Si (Li) detector system. On the contrary, this intensity ratio changed little in the cases of non-metallic scatterer samples such as lucite or mylar. This difference is interpreted as due to the occurrence of strong or weak interference in the coherent scattering photons.
Ruthenium, silver, rhenium, osmium, iridium, platinum and gold in standard rock samples from Geological Survey of Japan (JB-1, JB-2, JG-1 and JA-1) were determined by thermal neutron activation method with a systematic chemical separation. U.S. Geological Survey standard rocks (BCR-1 and G-2) were also analyzed to obtain an information about the accuracy and precision on the method. Generally agreement of our results with previous values for BCR-1 and G-2 was excellent. The noble metal contents in the igneous rocks from Japanese region were approximately comparable to those in the corresponding rocks from the continental region, and showed a tendency to decrease with increasing silica contents, with weak interrelations to other major elements.
201Tl myocardial scintigraphy was performed on 25 cases of prior myocardial infarction, and based upon phantom experiments, the infarct size was quantitatively analyzed as a defect segment percentage (DS%) . DS% was compared to the left cardiac function obtained from myocardial scintigrams, RI angiocardiograms, and chest X-ray films, and the results were examined. There was a high degree of correlation between DS% and LVEF and LVEDV/ m2 (r=-0.72, 0.84) . Where DS % was less than 25%, the left ventricular function was almost normal, and where DS % was greater than 25%, deterioration could clearly be seen. There was a correlation between left ventricular volume from myocardial scintigrams and heart volume from chest X-ray films. The201Tl uptake in the lung field from myocardial scintigrams increased as the infarct size increased, and the uptake in the upper lungs also increased.
The radioactive waste incineration plant at Tokai Research Establishment, JAERI, was installed in 1966 and has been operated routinely. The exhaust-gas system of the incinerator consists of spray scrubber, electrostatic precipitator, cloth filter, HEPA filter and so on. This experimental program was carried out to examine the behavior of tritium water to various parts of the incineration plant when combustible waste contaminated with tritium water was incinerated. The experimental results were as follows. The collection rate of tritium water in each dust collector was 85% in the spray scrubber, and 6 % as condensation water in electrostatic precipitator, gas cooler and HEPA filter. Further the release rate of tritium water from stack was 9%.