Abdullah Waidi I, Nur Hamizah MZ, Chen SC, Ahmad Z
(School of Health Sciences, USM, Kelantan)
To determine
the radiation exposure & contamination rate of patients
receiving
radioiodine (I-131) treatment for thyroid cancer in HUSM.
The patients
were given a dose of 80 – 150 mCi. The radiation
exposure
was then
measured at the chest and pelvic region of patients at the
difference
distances (0.5, 1.0 & 1.5 m) and taken after 1 and 24 hours of
I-131
administration. The contamination rate was determined at patient’s skin
at the same
distance as the exposure rate measurement.
The
radiation exposure of different dose ranging from 6–50 mR/h for
1-hour
and 2–30 mR/h for 24-hour measurements. The contamination rate
was
0–48 cpm after 4 hours and 0–14 cpm after 10 hours. After 24 hours,
this
value was 0–34 cpm.
This finding
(radiation exposure) complied with the Inverse Square Law
(exposure
rate decreases by increasing the square of distance). The
contamination
level in other hand depends on patient’s attitude towards
personal
hygiene.
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