| dc.description.abstract | Nasopharyng cancer is a malignant that anatomically has a definite border at the
nasopharyng area. The closest clinical organs and are in the irradiated field are the
eyes, the tolerance dose for the eye lens is 500 cGy on the TD 5/5 (complication
occurred no more than 5 % within 5 years). One of the methods to treat the
nasopharyng cancer is by using Linear Acelerator (LINAC) equipment and the
auxiliary instruments, such as lead block. The irradiated method used is 3 irradiated
fields method ( 2 latero-lateral fields and 1 antero-posterior field). The experiment was
using 66 pieces of thermoluminescent dosimeters (TLDs) that were placed on the right
and left eye lens 3 pieces each with 11 times of irradiation using the 200 cGy
fractionation. By doing the variance analysis (ANOVA), it is known that the mean of
those 6 pieces of TLDs are the same or identical. So then the experiment continued
with the frequency statistical analysis the results the data of absorbed dose in the eye
lens is 11,066 ± 1,315 cGy for each 200 cGy fractionation. If the mean absorbed dose
in the eye lens multiplied by 25 times of fractionation to fulfill the 5000 cGy
irradiation dose, it’s found that the absorbed dose taken by the eye lens is 243,775 –
309,525 cGy. This results show that the absorbed dose taken by the eye lens ( both
right and left) is still under the 500 cGy tolerance dose for eye lens. | en_US |
