opensource wrote: We never got to the bottom of this. So, JamesR, who was right – zapkitty or delt0r? Is the amount of radiation 20 minutes after shutdown the same as background?
Er… ~20 minutes is the [em]half-life[/em] of C11. It will take several hours for the totality of any C11 produced to decay back into non-radioactive B11. Then the core chamber should be safe for maintenance.
