Simulation of particle release for Diffusing Alpha-Emitters Radiation Therapy.

We used Monte Carlo simulations to study release of Ra daughter nuclei from the seed used for Diffusing Alpha-Emitters Radiation Therapy (DART). Calculated desorption probabilities for Po (15%) and Pb (12%) showed that they make a significant contribution to total release from the seed. We also showed that the dose to tissue from decays inside the 10 mm long seed exceeds 2.

GEANT 4 simulation of (99)Mo photonuclear production in nanoparticles.

GEANT 4 Monte-Carlo simulation toolkit is used to study the kinematic recoil method of (99)Mo photonuclear production. Simulation for bremsstrahlung photon spectrum with maximum photon energy 30MeV showed that for MoO3 nanoparticle escape fraction decreases from 0.24 to 0.

[Transanal endoscopic microsurgery].

Aim: To analyze the immediate and remote results of transanal endoscopic microsurgical intervantions and its role in treatment of rectal tumors.

Material And Methods: The results of transanal endoscopic microsurgery in 56 patients with rectal tumors were studied. Adenoma and adenocarcinoma were observed in 45 (80%) and 11 (20%) patients respectively.