Abstract
Radiation workers are compulsory to monitoring radiation dose for reduce the effects of ionizing radiation on the body. Government through similar BAPETEN maximum dose for radiation workers is 20 mSv/year. One of the personal monitoring tool that is widely used is the TLD-700 (specially for gamma radiation). The equivalent dose to the worker's body to a depth of 10mm (Hp(10)) able to be predicted from a simulation approach MCNPX. To simulation needed input model of geometry which adapted to the geometry experiments. The simulation results at the source position vertical to the dose rate is obtained 8,565mSv/h, which shows a difference of 1.5% on the results of the experiment, so the Hp(10) dose can be determined. This experiment able to simulated for contamination source 137 Cs on the floor position unable to be done experimentely contamination source. Estimation through simulation, the dose rate on the floor at 14.920 mSv/h. The results showed the difference of dose rate through dose rate 75% vertical source larger than the vertical direction. According to the result need to be calibration TLD-700 for the source position from the bottom. Because the greater the dose rate (from below), the greater the Hp(10) dose is received. With the result clear that considerable potential MCNPX used to estimate personal Hp(10) dose for radiation workers, specially in relation to the case of a radiation accident.
Highlights
Radiation workers are compulsory to monitoring radiation dose for reduce the effects of ionizing radiation on the body
The results showed the difference of dose rate through dose rate 75% vertical source larger than the vertical direction
008 [13] Reynaert, N., van der Marck, S.C., Schaart, D.R., Van der Zee, W., Van VlietVroegindeweij, C., Tomsej, M. et al (2007) Monte Carlo treatment planning for photon and electron beams
Summary
Eksperimen dilakukan dengan meletakkan TLD-700 di depan fantom PMMA berukuran 30×30×15 cm, lalu penyinaran dengan sumber137Cs yang di beri jarak 200cm dan energi 0,662 MeV sebagaimana di tunjukkan pada Gambar 1. Lalu di konversi ke dosis Hp(10) dengan cara nilai respon tersebut di kali dengan nilai faktor kalibrasi (FK) sebagaimana persamaan (1). Untuk perhitungan dosis Hp(10) dengan MCNPX di butuhkan beberapa informasi data diantaranya, data geometri TLD-700, fantom, model sumber dan satuan yang dinginkan pada output.Geometri yang yang di modelkan meliputi TLD-700, fantom, dan sumber. Ada tiga tahapan dalam MCNPX, yakni input data, proses running, dan interpretasi ouput. Dengan Pendekatan MCNPX data dilakukan dengan mengisikan beberapa kartu diantaranya adalah kartu sel, kartu permukaan, dan kartu data. Proses running memerlukan data pengulangan/nilai NPS tujuannya untuk meminimalisir nilai error
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