[Neutralization of static electricity charged on running vinyl chloride sheet by the use of soft beta-ray sources (author's transl)].
The feasibility of 147Pm and 3H beta-ray sources as static eliminator was experimentally investigated. A sheet of vinyl chloride of 0.1 mm in thickness was used as an example of electrified materials. Its surface charge densities before and after beta-ray neutralization were measured as the function of electrostatic charge changing the speed of the sheet and the distance between the beta-ray source and the sheet. With a 147Pm beta-ray source of 200mCi in effective activity, almost complete neutralization was found for the sheet with the charge density less than 6 X 10(-6) C/m2 running at the speed of 0.18 m/s. In the case of the running speed of 0.5 m/s frequently used in industry, the electrostatic charge below 3 X 10(6) C/m2, where corona discharger is not so effective, was also perfectly eliminated. It was found that the optimal distance between the beta-ray source and the  sheet was 10 cm in the case of 147Pm. The use of 3H beta-ray source of 1 Ci was not satisfactory. These results demonstrate that 147 Pm beta-ray source operates most efficiently as static eliminator when the charge density of material and/or its moving speed is not high.
D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004560:Electricity; D004583:Electrons; D005069:Evaluation Studies as Topic; D011399:Promethium; D011839:Radiation, Ionizing; D014316:Tritium; D014752:Vinyl Chloride; D014753:Vinyl Compounds
D014753:Vinyl Compounds; D014316:Tritium; D014752:Vinyl Chloride; D011399:Promethium