What's the half life of a helium 6 isotope?
The helium-6 isotope has a half-life of 806.7 ms.
Can you provide a reference to your number? Also, how accurate is this number?
Sure! [Here's a link to a reference regarding the number I provided above about the helium-6 isotope half-life](https://pubchem.ncbi.nlm.nih.gov/compound/Helium-6-atom#:~:text=Helium%2D6%20atom%20is%20the,half%2Dlife%20of%20806.7%20ms.)

According to the source, the number I provided above should be accurate.