merry-go-round reactor (turntable reactor)

https://doi.org/10.1351/goldbook.M03837
An apparatus in which several samples are rotated around a radiation source in order to expose each to equal amounts of radiation.
Source:
PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2254 (https://doi.org/10.1351/pac199668122223)