Is there any radiation when the X-ray machine is left inside the studio without being turned on?

When the X-ray machine is not turned on, there are no X-rays emitted, so there is no radiation.

And medical X-ray machines are low-energy, usually between 50 and 250 milliamps, so they don't produce any radiation on the human body. That is to say, even if the doctor's hand into the machine will not suffer any harm.