If you read the internet, you would think not. Ruby wrote a good article about that 7 years ago:
Things seem to have changed since then, as you will notice when reading. One being Rossi is now claiming radiation sickness after being exposed to his unshielded reactors, and strange radiation has become a hot topic. There are also anecdotal accounts surfacing of periodic, yet significant gamma bursts, and a growing list of radiation type sickness reports.
This is an important safety topic for the researchers in the field, and in particular for the amateurs chasing the dream without taking proper precautions.