Archived from radmon.org - originally posted 27/08/2019
This is a list of the common radioactive sources available on ebay (at the time of writing - 31/08/2019)
They vary a lot in radioactivity and I own all of these so I will try and give you my opinion of how active they are using an SBM-20 tube, in a rough, roundabout way. They will be marked 1 to 5 (5 being most active) based on the samples I own and based against each other. Where I have included the emission type (a, b & y (alpha, beta & gamma)) this is the overall emission. A lot of the different radiation types are caused from the main radionuclide decaying into other radionuclides. It is worth noting that different samples, even of the same type will more than likely produce different levels of radiation. For instance I have a Uranium glass sample (the one in my profile picture) and a Uranium glass vanity tray. The vanity tray is about 25x the volume/weight of the sample, yet the sample is very much more active than the tray. When buying rare samples, ores and minerals or other specific radioactive things the buyers will sometimes state 'high activity' or words to the effect.
Fiesta Ware: It is a Uranium glaze on pottery. Pretty active (b & y). Does not fluoresce. Geiger click score: 4/5
Ebay search: 'fiesta ware' 'fiestaware' 'uranium glaze' 'uranium pottery'
Uranium Glass: It is a glass coloured using Uranium similar to Vaseline glass. It does fluoresce. It's active (b). Geiger click score: 2/5
Ebay search: 'uranium glass' 'vaseline glass'
Vaseline Glass: Just like Uranium glass but different colour. It does fluoresce. Not very active (b & y(?)). SBM-20 click score: 1/5
Ebay search: 'vaseline glass' 'uranium glass'
Thorium Gas Mantle: A gas mantle impregnated with Thorium. Does not fluoresce. Goes like Billy'o (a, b & y). SBM-20 click score: 4.5/5
Ebay search: 'thorium mantle'
Thorium Tungsten Electrode: A Tungsten welding rod with <2% Thorium. Does not fluoresce. Hardly active (a, b & y). SBM-20 click score: 0.5/5
Ebay search: 'thorium tungsten' 'thorium electrode'
Americium disc: A small disc of Americium used in smoke detectors. Does not fluoresce. Quite active* (a, b & y). SBM-20 click score 3/5
Ebay search: 'americium' 'geiger smoke sensor'
*Goes to 11 when using a tube capable of detecting alpha - LND-712 alpha tube click score 10/5, but does have to be close.
Tritium Gas: A small Phosphor coated tube of Tritium gas. It does fluoresce and glows in the dark. Hardly even noticeable** (b). SBM-20 click score 0.1/5
Ebay search: 'tritium'
**Quite detectable with a scintillation meter.
Potassium Chloride: Also known as Potassium salt or KCI. Preferably has to be pure >99%. Does not fluoresce. Not very active (b & y). SBM-20 click score: 1/5
Ebay search: 'potassium chloride' 'potassium salt'
Radium Ra-226: Used mainly in the past for 'glow in the dark' watch hands and clock dials. Some heavy concentrations can be found on old aircraft clocks and dials. It does fluoresce. Quite active (a & b). SBM-20 click score: 2.5/5
Ebay search: 'radium' 'radium watch hands'
Uranium Ore: Just that, also known as Pitchblende. Does not fluoresce***. Reasonably active. SBM-20 click score 3/5
Ebay search: 'uranium ore' 'pitchblende'
***If you get Pitchblende with Gummite on it, the Gummite will fluoresce.
There are other natural forms of Uranium available on ebay. I don't have any so I can't comment on them. But the search terms are:
'uraninite' 'torbernite' 'autunite' 'gummite'
It is also worth searching for the general keywords such as 'uranium' 'thorium' etc. as occasionally you will find a hidden gem amongst the cruft. It was through that I managed to find Uranium trioxide sample, Uranium dioxide sample (yellowcake), soil contaminated with Uranium and Radium (from near a Uranium mine in Germany) and Thoriated cotton (some weird dirty looking fluffy stuff with tiny rocks mixed in - from a mine in Wales). So with some thorough searching you can sometimes find those rare gems and some really make the Geiger click!
A note on safety.
Some of these sources can be very harmful and potentially deadly (over time) if inhaled or ingested. Take Radium watch hands for example; the sources are usually a number of years old and the Radium (paint) can crumble and fall off the watch hands very very easily. It is too easy to get this on your fingers then inadvertently be ingested. Besides the radioactivity of the substance a lot are also biologically toxic to humans and other animals. When buying any radioactive source it is prudent to know your substance and learn about the hazards involved with it. If in doubt always wear gloves, keep a clean area when using the samples and clean/wipe down surfaces and wash hands after use. Always keep sources in a suitable container. Internet search for 'Radium girls'. A very sad but informative story.
