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This book covers the subject of absolute radiometry, one of the techniques employed in optical radiation metrology for the absolute measurement of radiant power. As expressed by the subtitle of the book ('Electrically Calibrated Thermal Detectors of Optical Radiation'), the term absolute radiometry as used throughout the text is interpreted in the narrow sense of 'the use of electrically calibrated detectors of optical radiation for the realization of an optical power scale. It is acknowledged that a wider interpretation of the term also exists, one that embraces all methods used for the realization of optical power scales. It is stressed right from the start that the wider interpretation does not apply in the context of this book, although other methods for realizing optical power scales are also discussed albeit in a much more condensed form.