Abstract
The circuit of radiation meter is designed for determination areal thickness of carpets as a non-destructive test using beta particles measurement technology. The design is based on design of stabilized DC voltage for the operation of GM, junction transistor for normalizing the pulses of GM, programmable microprocessor for integration of the pulses, and monitor for obtaining the result of measuring. The collected electronic pulses were processed after programming the used microprocessor. The designed instrument gave good results for determination of areal density of carpets and has low power consumption. It was tested by beta particles emitted from Sr-90 man-made source. The source satisfies site security and human health. The system is simple to use. Linear relationship between logarithmic values of counting rates and areal thickness is obtained. This relationship is utilized for determination of the areal thickness of carpets and adjusting the amount of latex coating during the production.