Comments on the NBS tritiated-water standards and their use

Abstract A panel of consultants of the International Atomic Energy Agency has recommended the adoption of the National Bureau of Standards tritiated-water standard and the half life of 12.43 yr for use in the WMO/IAEA precipitation survey. Factors are given to convert results obtained using a previous standard and half life to the newly recommended standard and half life. The preparation of a new low-level tritiated-water standard with an activity concentration of 1.312 s −1 g −1 is described.