Abstract
The beta dose rate, the shielding of beta radiation by protective clothing and the personnel doses caused by beta radiation during special activities were measured at two German nuclear power plants, one with a pressurised water reactor and the other with a boiling water reactor. Measurements were performed during refuelling outage and, in the case of the boiling water reactor, also during plant operation. Beta area dose rates of up to 440 mSv.h −1 were determined, the beta dose rates being up to a factor of 40 times the gamma dose rates. In most cases, low energy beta radiation was involved, which is largely shielded by protective clothing. In addition, however, radiation fields with high energy beta radiation were also detected ( 124 Sb)
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