Beetas and beetinys stop emitting radiation after waking up

Beetas and beetinys stop emitting radiation after they wake up from carbon dioxide induced sleep.

Before CO2:

After CO2 introduction:

After CO2 removal:

Strangely, they will begin emitting radiation if put to sleep again, but only while sleeping.  They will stop emitting after waking up again.

Edit: Reloading will also fix any non-radioactive beetas (until the next time the sleep).