Radiation Dose Estimates for Co-57 Vitamin B-12 (Cyanocobalamin)

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	Estimated Radiation Dose (mGy/MBq)
	No Flushing Dose		With Flushing Dose
ORGAN	Normals	Pernicious Anemia	Normals	Pernicious Anemia
Adrenals	4.7E+00	6.0E-01	3.1E+00	4.1E-01
Brain	6.6E-01	8.5E-02	4.4E-01	5.4E-02
Breasts	1.1E+00	1.5E-01	7.6E-01	9.7E-02
Gallbladder Wall	8.6E+00	1.1E+00	5.7E+00	7.8E-01
LLI Wall	1.3E+00	1.4E+00	9.8E-01	1.4E+00
Small Intestine	1.8E+00	4.0E-01	1.2E+00	3.3E-01
Stomach	2.0E+00	3.1E-01	1.3E+00	2.3E-01
ULI Wall	2.5E+00	8.0E-01	1.7E+00	7.0E-01
Heart Wall	2.9E+00	3.7E-01	1.9E+00	2.5E-01
Kidneys	3.4E+00	4.4E-01	2.3E+00	3.1E-01
Liver	3.5E+01	4.4E+00	2.3E+01	3.0E+00
Lungs	2.6E+00	3.3E-01	1.7E+00	2.2E-01
Muscle	1.4E+00	1.9E-01	9.0E-01	1.3E-01
Ovaries	1.3E+00	2.9E-01	8.5E-01	2.4E-01
Pancreas	4.3E+00	5.6E-01	2.9E+00	3.8E-01
Red Marrow	1.5E+00	2.2E-01	1.0E+00	1.5E-01
Bone Surfaces	2.5E+00	3.4E-01	1.6E+00	2.3E-01
Skin	8.2E-01	1.1E-01	5.5E-01	7.3E-02
Spleen	1.4E+00	1.9E-01	9.5E-01	1.3E-01
Testes	6.9E-01	1.0E-01	4.6E-01	6.8E-02
Thymus	1.3E+00	1.6E-01	8.5E-01	1.1E-01
Thyroid	8.3E-01	1.1E-01	5.6E-01	6.9E-02
Urinary Bladder Wall	9.6E-01	1.7E-01	5.8E-01	1.2E-01
Uterus	1.2E+00	2.2E-01	8.1E-01	1.7E-01
Effective Dose Equivalent	4.4E+00	6.7E-01	3.0E+00	5.0E-01

* Based on model in ICRP 53.
Dynamic bladder model with 4.8-hour voiding interval
Estimate calculated using phantom of Cristy & Eckerman (Report ORNL/TM-8381/V1 & V7)