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-Radon and thoron exhalation rate from soil is one of the most important factors that can influence the radioactivity level in the environment. Radon and thoron gases are produced by the decay of the radioactive elements those are radium and thorium in the soil, where its concentration depends on the soil conditions and the local geological background. In this paper, the results of radon and thoron exhalation rate measurements from surface soil of Bangka Belitung Islands at thirty six measurement sites are presented. Exhalation rates of radon and thoron were measured by using an accumulation chamber equipped with a solid-state alpha particle detector. Furthermore, the correlations between radon and thoron exhalation rates with their parent nuclide ( Rn exhalation rates higher than the world average value for the regions with normal background radiation.

Purpose of the study: Research This done with objective For analyze understanding draft mathematics competence number with using the Learning Model Team Assisted Individualization (TAI) for students class IV Madrasah Ibtidaiyah Al-Hidayah Kebon IX Muaro Jambi. Methodology: Deep data study This in the form of quantitative and qualitative data which is analyzed in a manner descriptive and data obtained through stages observation as much as 2 cycles with sample as many as 18 students. Main Findings: After done 2 cycles obtained happen enhancement understanding draft improved mathematic using learning models Team Assisted Individualization (TAI). enhancement results from understanding draft mathematics competence number student by 26.73%. Novelty/Originality of this study: Updating from study This is related research with enhancement understanding draft mathematics competence number with using the Learning Model The previous Team Assisted Individualization (TAI).