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Author: Subject: Detectable radioactivity from rubidium?
neptunium
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[*] posted on 19-12-2021 at 06:29


Rubidium 87 played an important role when measuring its concentration next to Strontium 87, The ratio can be used for dating earth and space rock.
Using the Nexion 5000 mass spectrometer form my old job, I was able to analyze it from a chunk of chondrite purchased on ebay.
The nice thing about isotopic ratio is that you dont even have to weight anything, it does not matter how much of the sample you use as long as you just want to determine the ratio, And using the Sr/Rb system I`ve got 3.78 billion years old.
I used other systems in this video, Some are better than others but they all hover around roughly the same age. Which is nice. The isochron method requires several analysis from different minerals found in the same rock and as you would expect the isotopic ratio is not very different, which can lead to errors . This was still a very cool project and I hope you enjoy it as much as I did

https://www.youtube.com/watch?v=d2VxKPYaXeo
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Crazy_Chemist
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[*] posted on 26-3-2022 at 22:30


I can't measure something from my ampoule with rubuĂ­dium with my gamma-scout.



Amateur chemist, just for fun!
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neptunium
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[*] posted on 23-4-2022 at 18:19


Quote: Originally posted by Crazy_Chemist  
I can't measure something from my ampoule with rubuĂ­dium with my gamma-scout.


why do you sound surprised ?
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Tsjerk
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[*] posted on 24-4-2022 at 00:33


Quote: Originally posted by neptunium  
The ratio can be used for dating earth and space rock.


Strontium is also used to determine the traveling of ancient humans, as the strontium in their teeth was deposited during their youth. When the amount of strontium found is different from what is found in the surrounding area, there must have been traveling involved.

https://www.google.com/amp/s/theconversation.com/amp/where-d...
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