Radiation Dose Estimates for Tc-99m MAA

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	Estimated Radiation Dose
ORGAN	mGy/MBq	rad/mCi
Adrenals	6.7E-03	2.5E-02
Brain	9.2E-04	3.4E-03
Breasts	5.0E-03	1.8E-02
Gallbladder Wall	5.6E-03	2.1E-02
LLI Wall	1.7E-03	6.1E-03
Small Intestine	2.0E-03	7.3E-03
Stomach	3.7E-03	1.4E-02
ULI Wall	2.2E-03	8.2E-03
Heart Wall	9.5E-03	3.5E-02
Kidneys	3.7E-03	1.4E-02
Liver	1.6E-02	5.9E-02
Lungs	6.7E-02	2.5E-01
Muscle	2.8E-03	1.1E-02
Ovaries	1.8E-03	6.7E-03
Pancreas	5.6E-03	2.1E-02
Red Marrow	3.3E-03	1.2E-02
Bone Surfaces	5.0E-03	1.9E-02
Skin	1.4E-03	5.4E-03
Spleen	4.1E-03	1.5E-02
Testes	1.1E-03	4.1E-03
Thymus	6.1E-03	2.3E-02
Thyroid	2.5E-03	9.3E-03
Urinary Bladder Wall	9.8E-03	3.6E-02
Uterus	2.3E-03	8.5E-03
Effective Dose Equivalent	1.3E-02 mSv/MBq	4.7E-02 rem/mCi

Model in ICRP 53 is adopted (data gathered in human subjects). Assumed distribution and retention:

Lungs 85% Tb = 6 hr 15% Tb = 72 hr
Liver 25% uptake Tb = 6 hr, elimination Tb = 120 hr
Kidneys residence time = .108 hr
Urinary bladder receives clearance from liver and long term clearance from lung. Dynamic bladder model used with a 4.8 hour voiding interval.