Textile industry is still behind in application of automatic control of sliver weight by cotton spinning gaging technique, because of difficulty in realizing reliable detecting instruments. Several methods of gaging such as by capacitance measurement, optical absorption, airmicrometer or mechanical feeler like “Autoleveller” have been developed for on-line meas-urement and control, but they did not resulted in success. In recent years, some advantages have been discussed for application of beta-ray radiation gaging techniques to sliver weight measurement, and despite the basic physical possibility no commercial type of this system has yet been realized, as its reliability, cost and safety requirement of health are not satisfied. We investigated a new type of detector having sliver guide unit combined with windows of chamber and radiation source. This sliver guide made of aluminum foil of 0.03mm has an air ejector at the input, by which a broken end of sliver can be easily guided in the hole when it should be inserted. Sliver can run away in the guide hole with loose contact to the guide wall so that it always sweeps away much flying cotton fiber which causes gage drift if it remains on the wall, and can avoid static charge effect as the running sliver is grounded through the wall. No error is made by position change of running sliver as it is well positioned by the guide and radiation not passing through sliver does not fall into the chamber by this detector arrangement. The dynamic weight of sliver while running must be compared with the static weight which is widely used in conventional quality control of sliver, as the dynamic weight depends on the drawing condition. We considered the effect of drawing tension and the appearance of running sliver in the guide. The experiments show good correlation between them using some constant determined by the speed of drawing. This sliver grain gage has204Tl of 15 mCi as a source and the all solid state electrometer using variable capacitance diode and gives the span of ±10% for 100 grains as a minimum range. The dynamic weight gives an accuracy within ±0.2% for 400 grains on the actual application to the drawing machine. The test has been made either for a long continuous operation more than a month or immediately after switching on. This beta-ray sliver grain gage will be used as the detector of cotton spinning machine controller.
The distribution of 3H-carbazochrome sodium sulfonate (3H-AC-17) has been studied in adult mice injected intravenously or subcutaneously by means of whole body autoradio-graphic technique. The compound injected either intravenously or subcutaneously was observed to be rapidly distributed systemically except the central nervous system. The main radioactivity was observed in the kidney, liver, skin and connective tissue. As to the connective tissue, high accumulation of radioactivity was detected particularly in the wall of aorta descendence, periost of vertebra, cartilage of trachea and fascia. The radioactivity in the skeletal muscle was much lower than that in the tendon or collagen fiber.
In recent years, human (whole-body) counters have been widely used in the field o health physics and nuclear medicine. This paper describes a new approach to whole-body counting method using the human counter at Tokyo University. The marked characteristics of this human counter is its three types of detectors installed for various counting purposes. By the combination of these detectors, whole-body counting, partial-body counting and linear scanning can be carried out simultaneously. The behavior of radioactive substances administered in human body is followed up by the combination method. The radioactivities in whole-body and partial-body of eight subjects were followed up in the period of 24 hours after the oral administration of Na131I by the combination method. It is shown that the combination method is available in the field of nuclear medicine and health physics, especially estimation of the dose derived from accidental intake of radioactive substances.
Paper chromatographic method and paper electrophoretic method for purity testing of 6 radiopharmaceuticals were studied. On paper chromatography, the most suitable developing solvents were shown as below; for Radio-Ferric Chloride: acetone-HCl-aq. dist. =4: 1: 3 for Sodium Radio-Chromate: n-butanol-methanol-aq. dist.-benzene =10: 20: 50: 1 for Radio-Cyanocobalamin: n-butanol pyridine-ethanol-6 N-HCl = 10: 40: 5: 30 for Radio-Chlormerodrin dimethylformamide-ethanol-aq, dist.=2: 8: 2 for Radio-Iodoinsulin: n-butanol-acetic acid-aq. dist.=3: 1: 4 On the other hand, good results were obtained for purity test of Radio-Iodoinsulin and Radio-Iodinated Serum Albumin (Human) by paper electrophoresis, using 20% formic acid and veronal buffer solution as the electrolyte respectively.