How much harm does petct do to the human body?

Petct check the use of tracer is containing trace positron nuclide and deoxyglucose conjugate, without any side effects, injected into the body of the radioactive drug is also very little, coupled with the end of the examination, drink more water will accelerate the metabolism of the drug, to do a petct examination of the human body's irradiation dose is only equivalent to the dose of a shot x-ray film. And the decay and excretion of extremely fast, the human body does not produce any harm.