PENGARUH PENGGUNAAN FAKTOR KALIBRASI S-137Cs PADA PENGUKURAN DOSIS SINAR-X DENGAN DETEKTOR IONISASI HP(10) STANDAR SEKUNDER

Abstract

The value of H_p(10) can be measured directly using H_p(10) secondary standard chamber that developed by Physikalisch Technische Bundensalt (PTB), Germany. H_p(10) secondary standard chamber type T 34035/0046 is connected with electrometer PTW Unidos T 10001 / Ns.11814. In this paper, the exposure was carried out by X-ray sources and ¹³⁷Cs for dose and radiation energy variations.The variations energy of X-ray were carried out using ISO 4037-1 quality narrow (N) spectrum within N-40 to N-300, while the radiation dose variations were carried out in the dose within range 0.1 mSv to 20 mSv. The use of the S-¹³⁷Cs calibration factor for the H_p(10) secondary standard chamber with an X-ray irradiation source were carried out and obtained a fairly good response result not in all energy ranges. The result obtained a relatively constant response to energy of 65 keV to 250 keV (energy quality N-80 to N-250), this corresponds to the deviation obtained i.e ≤ 7% from the normalization reference source of ¹³⁷Cs at 662 keV energy. Whereas for deviations below 3%, a relatively constant response has founded in the energy range of 100 keV to 250 keV (energy quality N-120 to N-250). The result obtained linier measurement on variations in dose according to changes in dose variation. The H_p(10) secondary standard chamber is capable for measuring variations of radiation dose, i.e from variations of 0.1 mSv to 20 mSv.