# RFQ - HPGe Gamma-Ray Spectrometer for Coincidence Counting

> Tender notice from UK public-sector procurement sources.

## Key facts

- Public buyer: [National Physical Laboratory](/buyers/national-physical-laboratory/contract-awards)
- Published: 14 October 2022
- Planned start: 5 December 2022
- Planned end: 4 December 2023
- Stage: open_tender
- Procurement category: goods
- Notice ID: 75a89392-1cf1-4e41-a2c6-2801d7c8b865-580588
- OCID: ocds-b5fd17-5936bbf8-3cab-4718-8b1a-fb27efb85d2e

## Description

The Nuclear Metrology group within the National Physical Laboratory \(NPL\) provides the traceability to the SI unit of the becquerel for a radionuclide through its primary standardisation facilities\. A powerful technique for determining the absolute activity of a radionuclide is by coincidence counting\. These coincidence counting systems are comprised of a particle detector and a gamma-ray detector which can be combined to simultaneously measure the disintegration rate and determine the detection efficiency\. The Nuclear Metrology group requires a mechanically cooled high-purity germanium \(HPGe\) gamma-ray spectrometer to replace an aged LN2-cooled HPGe gamma-ray spectrometer to be part of an upgraded coincidence system\. This will provide a high-resolution gamma-ray detection channel that can be used to form coincidences of specific gamma-ray emission with the corresponding particle emission, which is of particular importance for the absolute activity determination of electron-capture radionuclides\. Achieving good counting statistics in this gamma-channel is of particular importance and due to the activity limitations introduced by the particle detector a high relative efficiency for the HPGe gamma-ray spectrometer is required\. To this effect, NPL is seeking a 100% relative efficiency n-type HPGe gamma-ray spectrometer with an integrated electro-mechanical cryogenic cooling system\. Additional information: Please ensure that you register on Bravo Solutions \(link below\) to obtain the documents and submit your interest / intention to bid\.

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## Source

[View the original notice on Contracts Finder](https://www.contractsfinder.service.gov.uk/Notice/75a89392-1cf1-4e41-a2c6-2801d7c8b865-580588)