Please read the following story as reference and I am not in a position to guarantee any safety but -
Fewer cares such small radiation after the Fukushima Dai-ichi nuclear incident in my country because, though I will have to check older news again to describe in details but, more and more people in Tokyo have become radiation counter owners since the incident.
One day, a housewife in Tokyo detected stronger radiation, roughly in my memory ten times stronger than the safety level, walking on the road in her neibourhood. It was impossible for her because her location was as far as hundreds kilometers from Fukushima. Authority came to check immediately. They found a metal box under a house floor and there were several sets of radium in glass tubes inside. An old widow was living in the house and her husband was a scientist about sixty years ago. No one knows why he hid the box there but the couple, and probably their children, were living on the box for more than half a century as an ordinary family. The widow is, in my memory, now 92 and healthy.