It's very difficult to store metallic Sodium, but it's quite easy to store Sodium salts.
The relevant paragraph in Wikipedia is
> Also the higher specific activity caesium sources tend to be made from very soluble caesium chloride (CsCl), as a result if a radiography source was damaged it would increase the spread of the contamination. It is possible to make water insoluble caesium sources (with various ferrocyanide compounds such as Ni
2Fe(CN)
6, and ammonium ferric hexacyano ferrate (AFCF), Giese salt, ferric ammonium ferrocyanide) but their specific activity will be much lower.
For obvious reasons it's easier to find videos with metallic Sodium instead of metallic Cesium. Both are chemically similar and react with Oxygen very fast and must be stored protected from Oxygen, and water, and many other things. For example https://www.youtube.com/watch?v=u20yy-CycGU https://www.youtube.com/watch?v=dmcfsEEogxs
It's very difficult to store metallic Sodium, but it's quite easy to store Sodium salts.
The relevant paragraph in Wikipedia is
> Also the higher specific activity caesium sources tend to be made from very soluble caesium chloride (CsCl), as a result if a radiography source was damaged it would increase the spread of the contamination. It is possible to make water insoluble caesium sources (with various ferrocyanide compounds such as Ni 2Fe(CN) 6, and ammonium ferric hexacyano ferrate (AFCF), Giese salt, ferric ammonium ferrocyanide) but their specific activity will be much lower.