Abstract
Many studies have shown that there is a temporal side effects and chronic side effects during treatment
with radioactive 131I for the thyrotoxicosis diseases common and the percentage of the dominant
effects is less than 3% this includes spinal cord effects and leukemia .Our point of view is that this side
effect may be due to γ-ray radiated from the decay of 131I .By analysis of the decay scheme and using
TLDs dosimeters ,the γ – ray radiation dose from the frontal and dorsal side of the neck was measured
.The dosimeters were fixed on the back side of the neck and in front of the central part of the thyroid
gland , such that it measures γ-rays which penetrate the neck tissues , neck vertebral and the spinal
cord. A difference of 27.6% between the reading of frontal and the back dosimeter .This indicates
occurance of absorption by the neck tissue.We find also that for the same disease and for the different
cases, there is no direct relation between the taken iodine dose and the transmitted dose this may due to
the difference in the absorbed dose which depends on the degree of enlargemen
with radioactive 131I for the thyrotoxicosis diseases common and the percentage of the dominant
effects is less than 3% this includes spinal cord effects and leukemia .Our point of view is that this side
effect may be due to γ-ray radiated from the decay of 131I .By analysis of the decay scheme and using
TLDs dosimeters ,the γ – ray radiation dose from the frontal and dorsal side of the neck was measured
.The dosimeters were fixed on the back side of the neck and in front of the central part of the thyroid
gland , such that it measures γ-rays which penetrate the neck tissues , neck vertebral and the spinal
cord. A difference of 27.6% between the reading of frontal and the back dosimeter .This indicates
occurance of absorption by the neck tissue.We find also that for the same disease and for the different
cases, there is no direct relation between the taken iodine dose and the transmitted dose this may due to
the difference in the absorbed dose which depends on the degree of enlargemen