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Radiation Dose Estimates for I-125 mIBG


  Estimated Radiation Dose (mGy/MBq)
ORGAN mGy/MBq rad/mCi
     
Adrenals 4.2E-02 1.6E-01
Brain 1.4E-02 5.3E-02
Breasts 1.2E-02 4.5E-02
Gallbladder Wall 4.3E-02 1.6E-01
LLI Wall 1.7E-02 6.1E-02
Small Intestine 1.6E-02 5.9E-02
Stomach 1.7E-02 6.4E-02
ULI Wall 1.7E-02 6.2E-02
Heart Wall 8.3E-02 3.1E-01
Kidneys 2.0E-02 7.4E-02
Liver 2.2E-01 8.2E-01
Lungs 2.3E-02 8.3E-02
Muscle 1.6E-02 5.8E-02
Ovaries 1.6E-02 5.9E-02
Pancreas 2.6E-02 9.6E-02
Red Marrow 1.2E-02 4.4E-02
Bone Surfaces 3.1E-02 1.2E-01
Salivary Glands 7.0E-02 2.6E-01
Skin 1.1E-02 3.9E-02
Spleen 1.6E-01 5.9E-01
Testes 1.3E-02 4.8E-02
Thymus 1.5E-02 5.7E-02
Thyroid 4.6E-02 1.7E-01
Urinary Bladder Wall 1.4E-01 5.1E-01
Uterus 2.00E-02 7.50E-02
     
Effective Dose Equivalent 5.1E-02 mSv/MBq 1.9E-01 rem/mCi

Based on data gathered in patients - Jacobsson et al, 4th International
Radiopharmaceutical Dosimetry Symposium, CONF-851113, pp. 389-398. Assumed distribution and retention:
Total body 63 % Tb = 32.8 hours 36 % Tb = 3.05 hours
1 % Tb = ñ
Liver 21 % Tb = 32.8 hours 15 % Tb = 3.05 hours
0.3 % Tb = ñ
Spleen 0.6 % Tb = 178 hours
Sal. glands 0.04 % Tb = 32.8 hours
Thyroid 0.005 % Tb = 168 hours
Adrenals 0.02 % Tb = 48.6 hours
Heart wall 0.8 % Tb = 120 hours

Dynamic Bladder Model used (4.80 hour void)
36 % Tb = 3.00 hours 63 % Tb = 33.6 hours
Dose to salivary glands is self-dose only, based on 77 g mass and photon absorbed
fractions from MIRD Pamphlet No. 8. Salivary gland activity did not contribute to other organ doses. Estimate calculated using phantom of Cristy & Eckerman (Report ORNL/TM-8381/V1 & V7)