A name proposed in 1974 by the International Commission on Radiation Units and Measurements for a unit with a special name in SI for the reciprocal second “to be of general applicability.” Proposed symbol, Fr. The CGPM did not adopt the unit.

K. Lidèn.
SI Units in Biomedical Dosimetry.
Biomedical Dosimetry. Proceedings of an International Symposium on Advances in Biomedical Dosimetry Held by the International Atomic Energy Agency in Vienna, 10-14 March 1975.
Vienna: International Atomic Agency Agency, 1975.

Page 456.


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