APPARATUS FOR MEASURING AIR CONCENTRATIONS OF RADON AND THORON FILIATION PRODUCTS

摘要

P THIS APPARATUS FOR MEASURING INDIVIDUAL CONCENTRATIONS OF RAA, RAB, RAC, RAC, THA, THC, THC IN THE AIR, INCLUDES A SAMPLING HEAD 50 WITH THE INNER CHAMBER DIVIDED IN TWO PARTS BY A FLAT FILTER 51 WHICH FACES A DETECTOR OF RADIATION 30. / P P THE PART OF THE CHAMBER LOCATED BETWEEN THE DETECTOR AND THE FILTER MAY BE CONNECTED TO THE ENVIRONMENT THROUGH AN ELECTRO-VALVE 38, AND THE OTHER PART 32 OF THE CHAMBER MAY BE CONNECTED TO A VACUUM PUMP 54 THROUGH A SECOND ELECTRO-VALVE 52. THE DETECTOR 30 IS CONNECTED TO A MULTI-CHANNEL ANALYZER 58 THAT COUNTS ALPHA PARTICLES OF DIFFERENT ENERGY ISSUED BY RADON AND THORON FILIATION PRODUCTS, WHICH DETERMINES THE CONCENTRATION IN THE AIR OF THESE NUCLEIDES. / P