We take the suspension and wait for 20 min for also 60 mm column to obtain the grain size range of 1–8 μm for the fine-grain technique.
The separated grains are then allowed to deposit on aluminium discs placed at the bottom of individual flat-bottomed glass tubes.
The grains form a thin layer of a few μm thickness.
Then we put them in an oven to evaporate the acetone. The discs are then placed, in the RISØ set, on the heater plate using tweezers (Aitken, 1985).