The harmful radiation causes cancer. There is no such thing as a limit, below which the radiation dose is harmless. Small dose - small risk of cancer. High dose - high risk of cancer.
Nevertheless, there are defined legal limits for exposure during work for several professional activities, such as for X-ray assistants, airplane personnel, etc.
Space suits should reduce the radiation as much as possible, considering the additional weigth to bear. According to the protection class of the suit type the dose of radiation per hour is different and should be considered for planning.