Traditional alpha-particle detectors are limited by relatively poor sensitivity, small size, and difficulty of operation. These factors result in laborious effort and imprecise results. In addition, it is difficult for these detectors to monitor the inside of pipes and large areas having nonuniform surfaces. To be effective, traditional monitors require the probe to be held less than 1 cm from the surface while scanning with a slow, steady, and continuous motion. Long-range alpha detector (LRAD) technology overcomes the limitations imposed by the short range of alpha particles and provides a detailed analysis of alpha contamination in a cost-effective manner. Using a combination of LRAD airflow and electrostatic methods, we have developed several monitors for the detection of alpha contamination on hands and arms, in surface soil, and for radon gas.
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