Abstract
Barium sulphate suspensions (BSS) used in gastrointestinal radiography consist of barium sulphate microparticles which coat the mucosal surface of the digestive tract. The amount of BSS which adheres to the mucosa depends upon the procedure employed, the type of BSS, the amount and dilutions used, and the surface properties of the mucosa (Gelfand & Ott, 1982). These barium microparticles, once taken internally, penetrate deeply into the intestinal mucosa, even into the crypts between villi (Simmonds & James, 1976), forming tissue-barium interfaces. An interface between a solid metal and a tissue when irradiated yields a region of overdosage at the proximal interface and an underdosed region at the distal side (Dutreix & Bernard, 1966). However, suspended barium (atomic number (Z) = 56) microparticles release secondary electrons in all directions when irradiated, resulting in overdosage regions on both sides of the interface. In this communication, we report the measurement of doses at regions proximal and...
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