Beskrivning finns här:
https://www.orau.org/ptp/collection/con ... ntubes.htmRadioaktiviteten är till för att stabilsera tändspänningen och snabba upp tändningen. De förmodade strålningsdoserna finns med i texten. Troligen är det inte "farligt", men det kanske inte ska ligga under huvudkudden. En förklaring av sorten "rem" finns här:
https://en.wikipedia.org/wiki/Roentgen_equivalent_manEdit:
Jag hittade detta stycke i den wikipediaartikeln:
"The International Commission on Radiological Protection (ICRP) recommends limiting artificial irradiation of the public to an average of 100 mrem (1 mSv) of effective dose per year, not including medical and occupational exposures.[3] For comparison, radiation levels inside the US United States Capitol are 85 mrem/yr (0.85 mSv/yr), close to the regulatory limit, because of the uranium content of the granite structure.[12] According to the ICRP model, someone who spent 20 years inside the capitol building would have an extra one in a thousand chance of getting cancer, over and above any other existing risk. (20 yr × 85 mrem/yr × 0.001 rem/mrem × 0.055%/rem = ~0.1%) That "existing risk" is much higher; an average person would have a one in ten chance of getting cancer during this same 20-year period, even without any exposure to artificial radiation."