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Radiopharmaceutical Administered activity Upper large intestine (organ receiving the largest radiation dose) Effective dose MBq mCi mGy/MBq rad/mCi mSv/MBq rem/mCi Nonabsorbable solid labeled with 99mTc 18.5–37 0.5–1.0 0.11 0.41 0.024 0.089 Data are from Radiation Dose to Patients from Radiopharmaceuticals. London, U.K.: ICRP;1988:226. ICRP Publication 53.
Time point Lower limit (a lower value suggests abnormally rapid gastric emptying) Upper limit (a greater value suggests abnormally delayed gastric emptying) 0.5 h 70% 1.0 h 30% 90% 2.0 h 60% 3.0 h 30% 4.0 h 10% Data are from Am J Gastroenterol. 2007;102:1–11.