Abstract
It all began officially in 1912 when the new British National Radium Standard, prepared in Vienna and checked and polished by Madame Curie herself, was deposited at the National Physical Laboratory in Teddington. Or perhaps we should look to an earlier date, the beginning of 1906, when the Röntgen Society held a meeting to consider the need for a radioactive standard to act as a basis for X-ray dosimetry. From these beginnings to the present day, the National Physical Laboratory has been closely associated with the progress and development of radiology in this country, and with the Institute itself.
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