title: Radiation absorbed dose to the lens in dacryoscintigraphy with 99mTcO4-.
abstract: Calculations of the radiation dose to the lens for 99mTcO4- in dacryoscintigraphy are developed in some detail. The results indicate that the absorbed dose to the germinal epithelium of the lens is 2.2 X 10(-5) to 1.4 X 10(-4) rad/microCi (5.9 x 10(-12) to 3.8 x 10(-11) Gy/Bq) 99mTcO4- under physiological conditions. With blockage of the lacrimal drainage apparatus, the dose to the lens could increase to 4 X 10(-3) rad/microCi (1 X 10(-9) Gy/Bq).
mesh_terms: D003315:Cornea / Q000378:metabolism; D006801:Humans; D007765:Lacrimal Apparatus / Q000378:metabolism; D007767:Lacrimal Duct Obstruction / Q000378:metabolism; D007908:Lens, Crystalline / Q000033:anatomy & histology / Q000000981:diagnostic imaging* / Q000378:metabolism; D008954:Models, Biological; D011829:Radiation Dosage; D011877:Radionuclide Imaging / Q000379:methods; D013667:Technetium / Q000378:metabolism
chemical_list: D013667:Technetium