At or near the working level for use by laboratories making measurements of environmental radioactivity.

NPL environmental radioactivity standards

NPL supplies a range of over twenty different radionuclides for use as chemical yield tracers (e.g. in radiochemical separations and alpha spectrometry) and calibration of various detector systems such as liquid scintillation counters and sodium iodide gamma-detectors.

For further information and current prices for over fifty different products currently available, please download our product list: Environmental Radioactivity Standards from NPL

NPL also supplies a mixed radionuclide standard solution for the calibration of hyperpure germanium gamma spectrometers. This 'mix' is supplied at two activity levels (1 kBq g^-1 and 10 kBq g^-1) and fresh batches are issued twice a year in April and October. For further information on the NPL mixed nuclide, please download the listing: Mixed Radionuclide Standard Solutions

Advantages of using low-activity standardised solutions

• Activity handled is minimised to comply with the Ionising Radiations Regulations
• Standards are at or near the working level
• Minimal dilution and handling required, resulting in improved accuracy of measurement
• Reduced risk of contaminating low-background instruments
• The solutions are dispensed from bulk solutions traceable via verified dilutions to measurements of individual radionuclide solutions (carried out using either the techniques used in primary standardisations or a transfer instrument previously calibrated using a primary standard)
• The solutions are supplied in flame sealed glass ampoules of type Q as described in BS 795:1983

Details provided on Certificate of Calibration

• Activity per gram of solution
• Reference time
• Activity of any impurity radionuclides present
• Measurement uncertainty
• Chemical form

The activities shown in the price list are nominal values stated at the time of dispensing. The activity at the time of dispatch will depend on the dispensing date and the half-life of the radionuclide.

Download current Product List for Environmental Radioactivity Standards
Subject to availability, we aim to deliver your standards to you within four weeks of receipt of your order (except 'special orders', e.g. Mixed Nuclide and Organically Bound Tritium)

Contact

Customer Service tel: +44 20 8943 8695
E-mail: radioactivity_enquiries@npl.co.uk