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Chi tiết: The new environmental dosimeter for H*(10) measurements
The environmental equivalent dose is intended to serve as a good approximation for an effective dose for a person who is positioned facing any direction within measuring range of the radiation field. In contrast to the old open-air-area-dose-measured-quantity Hx there is now the environmental-equivalent-dose H*(10), defined on a phantom at 10 mm depth in the ICRU-sphere (International Commission on Radiation Units and Measurement).
Therefore the previous Hx-photon-area-dosemeters are not or are only partly usable for measurement the new measured-quantity H*(10). H*(10)-area-dosemeters should indicate the equivalent dose of enetrating radiation above 15 keV.