There are some electronic tubes that contain small quantities of radioactive materials to enhance the internal ionization processes. Such tubes have been used in the 20th century mostly in radar technology. Using a Geiger dosimeter, I have created a top of the tubes in my collection, based on their measured activity.

Some of the radioisotopes used in these tubes are Cesium-137, Cobalt-60, Radium-226, Krypton-85. Because of the small quantities involved and the short half-life, Co-60 and Kr-85 can't be detected outside the corresponding tubes, because these devices are old and with the passing time the radioactive atoms have decayed to stable elements.

Being mostly used in RADAR technology, the radioactive elements have been added to increase the electronic response by improving the internal ionization processes.

The film shows the following tubes, in order: 11TN40, MA340, 313CD, JAN-8370, JAN-4C35, TG-77, EII-43-100, JAN-346B, 1B26, 1B22

11TN40

11TN40_tube_111TN40_tube_211TN40_tube_311TN40_tube_4

MA340F

MA340F_tube_1MA340F_tube_2MA340F_tube_3MA340F_tube_4

313CD

313CD_tube_1313CD_tube_2313CD_tube_3313CD_tube_4

JAN-8370

jan8370_tube_1jan8370_tube_2jan8370_tube_3

JAN-4C35

jan4c35_tube_1jan4c35_tube_2jan4c35_tube_3

SIGNALITE TG-77

signalite_tg77_tube_1signalite_tg77_tube_2signalite_tg77_tube_3

EII-43-100

eii_43_100_tube_1eii_43_100_tube_2eii_43_100_tube_3eii_43_100_tube_4

JAN-346B

jan346_tube_1jan346_tube_2jan346_tube_3

1B26

1b26_tube_11b26_tube_21b26_tube_3

1B22

1b22_tube_11b22_tube_21b22_tube_3

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