In order to find which hydrogen is more active for the hydrogenation of ethylen, absorbed on strong site of nickel catalyst, or on weak site, the experiment was carried out by a modification of the diffential and kinetic isotope method using tritium as a tracer. Hydrogen (or tritium) was absorbed first on the reduced nickel catalyst at -78° and tritium (or hydrogen) was subsequently absorbed, then ethylene was added. After a certain hour, hydrogen, ethylene and ethane were drawn off from the reaction vessel and separated. The assay of tritium in every gas was then made using a G-M tube. The result led to a conclusion that the hydrogen absorbed on strong site is more active than that on weak site.
A new 32P beta-ray applicator devised by us consists of a thin film of agar-agar, which, after dissolving a certain amount of 32P, is coagulated and cut into a shape conforming to the skin lesion to be treated. The advantages of this method are as follows: 1. One can easily make an applicator with uniformly distributed radioactivity of any amount. As the radioactivity (μc/cm2) of each applicator can be easily obtained by the comparative measurement with G-M counter, the correct irradiated dose (μc·/cm2) will be calculated. 2. As this applicator is flexible and hardly torn, it can be attached closely to the affected skin. From our experiences its thickness of 4 to 10mg/cm2 is convenient for use. 3. As the agar-agar film is transparent, it can be attached precise to the affected part. Six to ten hours will be needed for making this applicator.