Additionally, the decay product of Pu-238 is U-234. Though a relatively 'safe' alpha emitter, it's half-life is ~200,000 years.
Note: With alpha emitters, it's 'safe' if it's outside your body, your skin can absorb it. But once you eat or inhale it, you get the full blast right into the quickest dividing cells in your body.
Note: With alpha emitters, it's 'safe' if it's outside your body, your skin can absorb it. But once you eat or inhale it, you get the full blast right into the quickest dividing cells in your body.