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Radium Standardization at the National Physical Laboratory

P Christmas and P Cross

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An account is given of radium measurements at the National Physical Laboratory from 1912, when the first British National Radium Standard was established, up to the present time. The implementation of a new method for the calibration of radium standards is described. This method is based upon germanium gamma-ray spectrometry used in conjunction with a well-characterized secondary standard, and it assures in the long term the continued traceability of NPL radium measurements to the 1934 British National Radium Standard of Hönigschmid.


PACS

06.20.F- Units and standards

29.40.-n Radiation detectors

Subjects

Accelerators, beams and electromagnetism

Nuclear physics

Instrumentation and measurement

Particle physics and field theory

Dates

Issue 1 (1983)

Received 4 June 1982



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