Examination of the effect of counting geometry on 125I monitoring using MCNP.
This paper theoretically investigates how the counting efficiencies of three selected detector (NaI) sizes are affected by neck-detector distance, detector misplacement, thickness of overlaying tissue, and size of the thyroid gland. The detector sizes were small, 2.54 cm diameter and 0.2 cm crystal thickness; medium, 7.62 cm diameter and 0.2 cm crystal thickness; large 30.48 cm diameter and 0.2 cm crystal thickness. The evaluations were determined using a Monte Carlo technique. The simulations show that the large detector minimizes the uncertainties for all problems except the thickness of overlaying tissue.
Kramer
G H
GH
Radiation Protection Bureau, Ottawa, Ontario, Canada.
Yiu
S
S
D006801:Humans; D007457:Iodine Radioisotopes / Q000032:analysis*; D008961:Models, Structural; D009010:Monte Carlo Method; D009333:Neck; D009929:Organ Size; D011879:Radiotherapy Dosage; D012974:Sodium Iodide; D013961:Thyroid Gland / Q000033:anatomy & histology
D007457:Iodine Radioisotopes; D012974:Sodium Iodide