[en] With the use of radiopharmaceutical preparation it is possible to label selectively the liquid or/and the solid component of the meal. This potentially allows to study the gastric emptying of liquids, of solids or of both simultaneously. However a severe limitation of all water soluble radiopharmaceuticals (usually markers of the liquid component of the meal) is their unpredictable intragastric dilution by secretion. Gastric emptying of solids is more reliably evaluated, because it appears to be largely independent of the volume of intragastric liquid. A radioisotopic technique for the study of gastric emptying of solid meals is described and validated. This technique is proved to be simple inexpensive and reproducible. It has been successfully used to study the effect of new drugs and gastrointestinal peptides on gastric motility in man