  Artificially-grown diamond crystals have unique properties that make them
suitable as solid-state particle detectors and dosimeters in high-radiation
environments. Sensors based on single-crystal diamond grown by chemical vapour
deposition have been chosen for dosimetry and beam-loss monitoring at the
SuperKEKB collider. We describe the criteria for the selection of the diamond
sensors, their purpose-designed mechanical packaging, and the suite of test and
calibration procedures adopted to characterise them. The results obtained on 28
detectors are reported, allowing to evaluate the stability and uniformity of
the response of these devices.
