A hand and foot monitor

The laboratory design of hand and foot monitor is discussed. The main purpose of which is to detect the presence of radioactive contamination on hand and foot. It is designed as a stationary apparatus and functions as an alarm system in cases where the maximum permissible concentration of radioactivity on the surface of foot and hand is exceeded. The maximum permissible concentration of radioactivity on term ''exposure'' has been fixed 0.35 mR/Hr. Further details of the apparatus are as follow: A contamination level of 0.35 mR/hr and above is marked by a red pilot lamp flash, whereas below it, a green one prevails. To detect the presence of radiation a G.M. tube is used which operates in the range between 10-4-IR/hr. A yellow pilot lamp indicates the stand by condition. A circuit employing a LDR is used to regulate the stand by and the operating condition. Relevant to the design and the detector used, the type of radiation detected comes from Gamma emitting sources. (author)