PENGUJIAN SHIELDING RADIASI UNTUK FASILITAS CT SCAN SINAR-X 3D

MUHAMAD FAIZZAN NUR, Drs. Gede Bayu Suparta M.S., Ph.D.

2019 | Skripsi | S1 FISIKA

Telah dilakukan pengujian terhadap rancangan tameng (shielding) radiasi sinar-x berbahan paving block untuk fasilitas CTScan. Pengujian dilakukan dengan melakukan pengukuran laju dosis radiasi sinar-x pada enam belas titik (I_0 - I_15) kemudian dibagi menjadi tiga area (A, B dan C) yang mencakup sekitar fasilitas CTScan yang telah diberi shielding dan ruang kontrol alat tersebut (lokasi peneliti). CTScan tersebut diatur pada tegangan sebesar 200 kV, arus 5 mA dan waktu paparan 0,2 menit. Penelitian ini bertujuan untuk mengetahui efektifitas penggunaan bahan paving block sebagai shielding dalam menyerap radiasi sinar-x yang diwakilkan dengan nilai koefisien attenuasi (\mu) dan mengetahui hubungan antara laju dosis radiasi sinar-x dengan kuadrat jarak sumber radiasi. Hasil penelitian menunjukkan nilai \mu shielding paving block di area A sebesar 0,62 ± 0,01 m^(-1) yang mampu menyerap radiasi sinar-x sebanyak 20%, di area B sebesar 4,78 ± 0,05 m^(-1) yang mampu menyerap radiasi sinar-x sebanyak 85,3%, dan di area C sebesar 0,89 ± 0,03 m^(-1) yang mampu menyerap radiasi sinar-x sebanyak 24%. Selain itu, dapat diketahui bahwa laju dosis pada suatu titik (I_x) semakin kecil dengan bertambahnya jarak R terhadap sumber.

The radiation shielding testing has been carried out on an x-ray shielding made from paving blocks for a CTScan facility. The test was carried out by measuring the dose of x-rays radiation at sixteen points (I_0 - I_15) then divided into three areas (A, B and C) which included around the CTScan facility that had been shielded and the control room of the device (location of the researcher). The CTScan is set at a voltage of 200 kV, a current of 5 mA and a exposure time of 0.2 minutes. This study aims to determine the effectiveness of paving block materials as shielding in absorbing x-ray radiation represented by attenuation coefficient (\mu) and knowing the relationship between x-ray radiation dose rates and the square of the radiation source distance. The results of this study indicate that the value of \mu paving blocks shielding in area A of 0.62 ± 0,01 m^(-1) is able to absorb x-ray radiation as much as 20%, in area B 4,78 ± 0,05 m^(-1) is able to absorb x-ray radiation as much as 85.3%, and in area C of 0.89 ± 0,03 m^(-1) is able to absorb radiation x-rays as much as 24%. In addition, it can be seen that the dose rate at a point (I_x) is getting smaller with increasing distance.

Kata Kunci : Key words: Shielding, block paving, x-rays, attenuation coefficient