To: Sacajaweau
Because there’s a background rate of cosmic rays that continuously produces it. What they have found is a layer with more than this expected background amount (correcting for natural decay) about 10 My ago.
16 posted on
02/16/2025 7:19:54 AM PST by
coloradan
(They're not the mainstream media, they're the gaslight media. It's what they do. )
To: coloradan
The half life is 1.39 My, so 10My ago is about 7 half lives, so 2^-7 or about 1/128th of what was then present still remains today.
18 posted on
02/16/2025 7:22:21 AM PST by
coloradan
(They're not the mainstream media, they're the gaslight media. It's what they do. )
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