Tube Number Manufacturer Tube Description Isotope Activity 0A2 Raytheon Voltage Regulator Co-60 0.2 µCi 0A2WA/6626 Voltage Regulator Ra-226 6 µCi 0.005 0A2WA/6626 Voltage Regulator Ra-226 µCi 0A2WA/6626 CBS Hytron Voltage Regulator Ni-63 0.5 µCi 0A2WA/6626 English Elec. Valve Voltage Regulator U-238 0.1 µCi 0A2WA/6626 Tung-Sol Voltage Regulator Ni-63 Unknown 0A2WA/6626 Raytheon Voltage Regulator Co-60 0.2 µCi 0A3 Sylvania Voltage Regulator Co-60 1.0 µCi 0B2 Raytheon Voltage Regulator Co-60 0.2 µCi 0B2WA/6627 English Elec. Valve Voltage Regulator U-238 0.1 µCi 0B2WA/6627 Raytheon Voltage Regulator Co-60 0.2 µCi 0B2WA/6627 Heintz & Kaufman Voltage Regulator Ra-226 6.0 µCi 0C3 Sylvania Voltage Regulator Co-60 1.0 µCi 0C3W Sylvania Voltage Regulator Co-60 1.0 µCi Unknow 003-2 Amperex Voltage Regulator Unknown n 1B22 Bomac Spark-Gap Radar Modulator Co-60 0.25 µCi 1B22 Western Electric Spark-Gap Radar Modulator Ra-226 Unknown 1B23 Central Electron. Spark-Gap Switch Co-60 1.0 µCi 1B24A Bomac Transmit-Receive Switch Co-60 0.15 µCi 0.475 1B24A General Electric Transmit-Receive Switch Co-60 µCi 1B24A Microwave Assoc. Transmit-Receive Switch Co-60 0.5 µCi 1B24A Omni-Wave Transmit-Receive Switch Co-60 0.23 µCi 1B24A Sylvania Transmit-Receive Switch Co-60 1.0 µCi 1B24A Westinghouse Transmit-Receive Switch Ra-226 2.0 µCi 1B24A Metcom Transmit-Receive Switch Co-60 Unknown 1B26 Bomac Transmit-Receive Switch Co-60 0.15 µCi 1B27 Bomac Transmit-Receive Switch Co-60 0.15 µCi 1B35 Westinghouse Anti-Transmit-Receive Switch Ra-226 >4.3 µCi 1B35A Bomac Anti-Transmit-Receive Switch Co-60 0.3 µCi 1B35A General Electric Anti-Transmit-Receive Switch Co-60 0.95 µCi 1B35A Sylvania Anti-Transmit-Receive Switch Co-60 1.0 µCi 1B37A Bomac Anti-Transmit-Receive Switch Co-60 0.3 µCi 1B37A General Electric Anti-Transmit-Receive Switch Co-60 0.95 µCi 1B37A Sylvania Anti-Transmit-Receive Switch Co-60 1.0 µCi 0.475 1B38 Western Electric Pre-Transmit-Receive Switch Co-60 µCi 11339 Bomac Gas Switching Co-60 0.3 µCi 1B41 Bomac Spark Gap Radar Modulator Co-60 0.25 µCi 1B41 Western Electric Spark Gap Radar Modulator Ra-226 1.0 µCi 1B41 Westinghouse Spark-Gap Radar Modulator Ra-226 Unknown 1B42 Machlett Spark-Gap Radar Modulator Ra-226 1.0 µCi 1B44 Bomac Anti-Transmit-Receive Switch Co-60 0.3 µCi 0.475 1B44 General Electric Anti-Transmit-Receive Switch Co-60 µCi 1B44 Sylvania Anti-Transmit-Receive Switch Co-60 1.0 µCi 1B45 Bomac Spark Gap Radar Modulator Co-60 0.25 µCi 1B45 Western Electric Spark Gap Radar Modulator Ra-226 2.0 µCi 1B50 Bomac Transmit-Receive Switch Co-60 0.15 µCi 1B51 Bomac Anti-Transmit-Receive Switch Co-60 0.3 µCi 1B53 Bomac Anti-Transmit-Receive Switch Co-60 .3 µCi 1B54 Bomac Pre-Transmit-Receive Switch Co-60 0.3 µCi 1B55 Bomac Transmit-Receive Switch Co-60 0.4 µCi 1B56 Bomac Anti-Transmit-Receive Switch Co-60 0.3 µCi 0.475 1B56 General Electric Anti-Transmit-Receive Switch Co-60 µCi 1B56 Sylvania Anti-Transmit-Receive Switch Co-60 1.0 µCi 1B58A/6117 Bomac Transmit-Receive Switch Co-60 0.1 µCi 0.475 1B58A/6117 General Electric Transmit-Receive Switch Co-60 µCi 1B58A/6117 Microwave Assoc. Transmit-Receive Switch Co-60 0.5 µCi 1B58A/6117 Sylvania Transmit-Receive Switch Co-60 1.0 µCi Unknow 1B59/R1130B Sylvania Cold-Cathode FAX Unknown n 1B60 Bomac Transmit-Receive Switch Co-60 0.15 µCi 1B60 Bomac Transmit-Receive Switch Co-60 0.15 µCi 1B60 Westinghouse Transmit-Receive Switch Ra-226 2.0 µCi 0.7-10 1B63A Microwave Assoc. Fixed Tuned Gas Switchina., Co-60 µCi 1B63A,B Bomac Transmit-Receive Switch Co-60 0.15 µCi 0.475 1B63A,B General Electric Transmit-Receive Switch Co-60 µCi 1B63A,B Microwave Assoc. Transmit-Receive Switch Co-60 0.5 µCi 1B63A,B Sylvania Transmit-Receive Switch Co-60 1.0 µCi 0.002 1C21/5823 Sylvania Cold-Cathode Triode Relay Kr-85 µCi 1Z2 Chatham Rectifier Th-232 Unknown 3B24WA RCA Radar Transmitting Rectifier Th-232 0.15 µCi 3CX3000 Varian Power Triode Th-232 Unknown 12AT7 Phillips High-mu Dial Triode Re-187 .1 µCi Unknow 12AX7/575I Duotriode Unknown n 290-1343-PI Raytheon Co-60 0.8 µCi 313C Western Electric Double-Gap Cold-Cathode Triode Kr-85 0.5 µCi 313C Western Electric Double-Gap Cold-Cathode Triode Ra-226 0.05 µCi 313CA Western Electric Double-Gap Cold-Cathode Triode Kr-85 0.5 µCi 313CA Western Electric Double-Gap Cold-Cathode Triode Ra-226 0.05 µCi 313CB Western Electric Double-Gap Cold-Cathode Triode Kr-85 Unknown 313CC Western Electric Double-Gap Cold-Cathode Triode Ra-226 0.01 µCi 313CC Western Electric Double-Gap Cold-Cathode Triode Kr-85 0.5 µCi 313D Western Electric Double-Gap Cold-Cathode Triode Kr-85 0.50 µCi 346B Western Electric Cold-Cathode Triode Ra-226 1.0 µCi 346C Western Electric Cold-Cathode Triode Kr-85 4.5 µCi 353A Western Electric Cold-Cathode Triode Kr-85 0.5 µCi 353A Western Electric Cold-Cathode Triode Ra-226 0.01 µCi 357 Bomac Co-60 Unknown 358A Western Electric Cold-Cathode Indicator Kr-85 0.05 µCi 359A Western Electric Cold-Cathode Relay Kr-85 0.5 µCi 359A Western Electric Cold-Cathode Relay Kr-85 0.5 µCi 371B EEC Diode Rectifier Th-232 0.15 µCi 372A Western Electric Cold-Cathode Voltage Regulator Ra-226 Unknown 376A Western Electric Cold-Cathode Voltage Regulator Ra-226 Unknown 376A Westinghouse Kr-85 4.0 µCi 376B Western Electric Cold-Cathode Voltage Regulator Ra-226 1.0 µCi 376C Western Electric Cold-Cathode Voltage Regulator Kr-85 1.2 µCi Unknow 412A AT&T Full-Wave Rectifier Unknown n Unknow 412A Western Electric Full-Wave Rectifier Unknown n 413* Anton C-14 1.0 µCi 413A Western Electric Cold-Cathode Relay Ra-226 1.0 µCi 413B Western Electric Cold-Cathode Relay Kr-85 4.4 µCi 414 Anton C-14 1.0 µCi 421 Anton C-14 1.0 µCi 423A/6140 Western Electric Cold-Cathode Voltage Regulator Ra-226 0.01 µCi 423C Western Electric Cold-Cathode Voltage Regulator Kr-85 4.5 µCi 425A Western Electric Cold-Cathode Relay Kr-85 2.1 µCi 426A Western Electric Cold-Cathode Ringer Kr-85 2.0 µCi 427A/6141 Western Electric Cold-Cathode Kr-85 4.0 µCi 430A Western Electric Cold-Cathode Ra-226 Unknown 430B Western Electric Cold-Cathode Kr-85 4.5 µCi 430C Western Electric Cold-Cathode Kr-85 >15 µCi 432B Western Electric Cold-Cathode Voltage Reference Kr-85 4.5 µCi 439A/6167 Western Electric Gas Discharge Stepping Kr-85 0.5 µCi 446A Western Electric Cold-Cathode Kr-85 0.1 µCi 447A Western Electric Cold-Cathode Indicator Kr-85 0.1 µCi 451A Western Electric Cold-Cathode Relay Kr-85 2.1 µCi 458A Western Electric Voltage Surge Protector Ra-226 1 µCi Unknow 471A General Electric Voltage Surge Protector Unknown n 475 Anton C-14 1.0 µCi 476 Anton C-14 1.0 µCi 721B Bomac Double-Gap Gas Switch Co-60 0.15 µCi 724B Bomac Transmit-Receive Switch Co-60 0.15 µCi 809 RCA Transmitting Triode Th-232 0.15 µCi Unknow 1960/30Z RCA Gas Switching Unknown n 5027 Ra-226 0.26 µCi 0.005 5651WA/STV85 Neon Voltage Reference Ra-226 µCi 5651WAYSTV85 Raytheon Neon Voltage Reference Co-60 0.2 µCi 5682 Machlett Transmitting Triode Th-232 0.13 µCi Unknow 5751/12AX7 Duotriode Unknown n 5783WA/M8190/85A Raytheon Voltage Reference Co-60 0.2 µCi 3 5787 Raytheon Voltage Regulator Co-60 0.2 µCi 5787WA Raytheon Voltage Regulator Co-60 0.2 µCi 5787WB Raytheon Voltage Regulator Co-60 0.2 µCi 5790/X7108 Sylvania Transmit-Receive Switch Co-60 1.0 µCi 5791/Z6007 Sylvania Anti-Transmit-Receive Switch Co-60 1.0 µCi 5792/ATR345 Bomac Anti-Transmit-Receive Switch Co-60 0.3 µCi 5792/ATR345 Sylvania Anti-Transmit-Receive Switch Co-60 1.0 µCi 5793/ATR346 Bomac Anti-Transmit-Receive Switch Co-60 0.3 µCi 5793/ATR346 Sylvania Anti-Transmit-Receive Switch Co-60 1.0 µCi 0.002 5823/1C21 Sylvania Cold-Cathode Triode Relay Kr-85 µCi 5853/1C21 Bomac Transmit-Receive Switch Co-60 0.3 µCi 5853/TR368 Bomac Transmit-Receive Switch Co-60 0.3 µCi 5853/TR368 Bomac Transmit-Receive Switch Co-60 0.4 µCi 5853/TR368 Microwave Assoc. Transmit-Receive Switch Co-60 0.5 µCi 5853/TR368 Sylvania Transmit-Receive Switch Co-60 1.0 µCi 5863/X7109 Bomac Transmit-Receive Switch Co-60 0.15 µCi 5863/X7109 Sylvania Transmit-Receive Switch Co-60 1.0 µCi 5864/ATR321 Bomac Anti-Transmit-Receive Switch Co-60 0.3 µCi 5864/ATR321 Sylvania Anti-Transmit-Receive Switch Co-60 1.0 µCi 5865/TR361 Bomac Transmit-Receive Switch Co-60 0.15 µCi 5865/TR361 Sylvania Transmit-Receive Switch Co-60 1.0 µCi 5883 Litton Anti-Transmit-Receive Switch Co-60 1.0 µCi 5921 Bomac Anti-Transmit-Receive Switch Co-60 0.3 µCi 5922 Bomac Anti-Transmit-Receive Switch Co-60 0.3 µCi 5927 Bomac Transmit-Receive Switch Co-60 0.4 µCi 5939 Westinghouse Pre-Transmit-Receive Switch Ra-226 3.3 µCi 5939A Bomac Pre-Transmit-Receive Switch Co-60 0.3 µCi 5939A Pre-Transmit-Receive Switch Ra-226 3.3 µCi 5962 Voltage Regulator C-14 10.0 µCi 5962/8S- Anton Voltage Regulator C-14 1.0 µCi 101/C1K1017 5962/BS-101/CK1017 Electronic Products Voltage Regulator Ni-63 3.0 µCi 6022/ATR332 Bomac Anti-Transmit-Receive Switch Co-60 0.3 µCi 6024/ATR387A Bomac Anti-Transmit-Receive Switch Co-60 0.3 µCi 6035 Bomac Transmit-Receive Switch Co-60 0.15 µCi 6081/ATR407 Bomac Anti-Transmit-Receive Switch Co-60 0.3 µCi 6081/ATR407 Sylvania Anti-Transmit-Receive Switch Co-60 1.0 µCi 6083/AX9909 Bomac Transmitting Pentode Co-60 0.3 µCi 6117/1B58 Bomac Transmit-Receive Switch Co-60 0.4 µCi 0.475 6117/1B58 General Electric Transmit-Receive Switch Co-60 µCi 6117/1B58 Microwave Assoc.