Monte Carlo simulation using PRIMO code as a tool for checking the credibility of commissioning and quality assurance of 6 MV TrueBeam STx varian LINAC.

Aim: To validate and implement Monte Carlo simulation using PRIMO code as a tool for checking the credibility of measurements in LINAC initial commissioning and routine Quality Assurance (QA). Relative and absolute doses of 6 MV photon beam from TrueBeam STx Varian Linear Accelerator (LINAC) were simulated and validated with experimental measurement, Analytical Anisotropic Algorithm (AAA) calculation, and golden beam.

Methods And Materials: Varian phase-space files were imported to the PRIMO code and four blocks of jaws were simulated to determine the field size of the photon beam.

A survey of natural terrestrial and airborne radionuclides in moss samples from the peninsular Thailand.

The aim of this study was to determine the activity concentrations of natural terrestrial radionuclides (U, Ra, Th and K) and airborne radionuclides (Pb, Pb and Be) in natural terrestrial mosses. The collected moss samples (46) representing 17 species were collected from 17 sampling localities in the National Parks and Wildlife Sanctuaries of Thailand, situated in the mountainous areas between the northern and the southern ends of peninsular Thailand (∼7-12 °N, 99-102 °E). Activity concentrations of radionuclides in the samples were measured using a low background gamma spectrometer.