Revvity, 6004052A, Tritiated Water Internal Standard

The Revvity Tritiated Water Internal Standard supports efficiency determination and disintegrations-per-minute calculations for aqueous samples measured by liquid scintillation counting. A defined quantity of tritiated water is introduced into an appropriate counting sample so that the change in measured response can be used to calculate counting efficiency under the applicable analytical procedure. The internal standard is calibrated by activity per unit mass, approximately 2.5 × 10⁶ DPM/g, rather than exclusively by volume. Mass-based calibration helps avoid an additional source of uncertainty from temperature-related volume changes. The aqueous ³H reference is supplied in a 10 mL unit with a nominal activity concentration of approximately 1.13 µCi/mL. Select an aliquot that is appropriate for the scintillation cocktail, sample matrix, detector and laboratory radiation-handling procedure. Account for any change in sample activity introduced by the standard during calculations and retain separate quality-control measurements for analytical comparability. The product contains radioactive material, not nonradioactive water, and its receipt and use require suitable radiation safety authorization and waste management.