2. Materials and methods

In this work, the Monte Carlo calculations have been performed to calculate the dose distribution around the eye plaque. The Monte Carlo method is a numerical technique using random numbers and probability to solve problems. It performs an effort to model nature through direct simulation for any possible results, by a probability distribution, for any cause that has inherent uncertainty. The name of this method comes from the casino name in Monaco, because of roulette, a simple random number generator. Clinical dose calculations are generally carried out with the patient treated as water equivalent and a dose of 85 Gy prescribed to the tumour apex. In the calculation the effects from the presence of the plaque backing, insert and intraocular media are considered [19]. In this work, the dose distributions were simulated using the MCNP5 Monte Carlo (MC) radiation transport code published by the Los Alamos National Laboratory, and the MCPLIB04 photon cross-section library is based on the ENDF/B-VI data [20]. The 103-Pd photon spectrum used in these simulations was obtained from TG-43U1 table XIII [18]. To calculate absorbed dose and kerma, the particle fluence and cell-heating tallies, F4 and F6, have been used, respectively.
