b. Leakage of tar-like substance from headset jack, resulting in shorts across the printed circuit board underneath calibration potentiometer. c. Substandard printed circuit board with difficulties in unsoldering and resoldering component connections such as tubes, capacitors, resistors, etc, d. 2.4.5 Calibration drift over a period of a few days. Integrons The Integrons were not used to a large extent, They calibrated and checked easily, and were relatively rugged. 2.4.6 Thyac The Thyac alpha scintillation survey meter was gamma responsive in a radiation field above 500 mr/hr. However, for normal personnel or equipment monitoring, the instrument worked adequately, 2.4.7 MX-5 The Beckman MX-5 beta-gamma low range personnel monitoring instrument performed very well, though many were not used due to the lack of spare parts, was easy to calibrate. 2,4,.8 The instrument was rugged, had good stability and This instrument is no longer in production, PAC-3-G The Eberline PAC-3-G alpha proportional survey meter was an adequate monitoring instrument but required a daily check-out and readjustment of the gas-flow system. damaged in the field. The probe assembly was easily However, if the monitor utilizing the instrument 9