– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
Search facility:


| Site map | News | Contact us
CIPM, 1984: Recommendation 1
Version française
 
Concerning the sievert*

The Comité International des Poids et Mesures,

considering the confusion which continues to exist on the subject of Resolution 5, approved by the 16th Conférence Générale des Poids et Mesures (1979),

decides to introduce the following explanation in the brochure "Le Système International d'Unités (SI)":
The quantity dose equivalent H is the product of the absorbed dose D of ionizing radiation and the dimensionless factors Q (quality factor) and N (product of any other multiplying factors) stipulated by the International Commission on Radiological Protection:

H = Q . N . D.

Thus, for a given radiation, the numerical value of H in joules per kilogram may differ from that of D in joules per kilogram depending upon the values of Q and N. In order to avoid any risk of confusion between the absorbed dose D and the dose equivalent H, the special names for the respective units should be used, that is, the name gray should be used instead of joules per kilogram for the unit of absorbed dose D and the name sievert instead of joules per kilogram for the unit of dose equivalent H.



Reference:
Procès-Verbaux des Séances du CIPM (1984), p. 31
Metrologia, 1985, 21(2), 89-92

Note:

The CIPM, in 2002, decided to change the explanation of the quantity dose equivalent in the SI Brochure (Recommendation 2).
 
Summary
Members of the CIPM
Consultative Committees
CIPM Sub-Committees and ad hoc Groups
Joint Working Groups
ad hoc Working Group on Governance
Strategic planning: BIPM and Consultative Committees
CIPM publications
CIPM election process
Photographs of the CIPM