Muhittin Sahan

The Study of ( n , 2 n ) Reaction Cross Sections for Ce and Nd Isotopes up to 20 MeV

Neutron cross section calculations for 136Ce(n, 2n)135Ce, 138Ce(n, 2n)137Ce, 140Ce(n, 2n)139Ce, 142Ce(n, 2n)141Ce, 142Nd(n, 2n)141Nd, 144Nd(n, 2n)143Nd, 146Nd(n, 2n)145Nd, 148Nd(n, 2n)147Nd, and 150Nd(n, 2n)149Nd were done in the incident energy range from 10 to 20 MeV. The calculations were performed using three codes TALYS-1.6 for two-component Exciton model, EMPIRE-3.2 Malta for Exciton model, and ALICE/ASH for the Geometry-Dependent Hybrid (GDH) model. The results of model calculations were compared with the available experimental data and also with the evaluated data in the TENDL-2015 (based on the modified TALYS code), ENDF/B-VII.1 libraries. The calculated cross section data were compared with the available experimental data obtained from EXFOR and also compared with semiempirical formulas around 14–15 MeV. The results of model calculation were found to be in good agreement with the experimental data given in literature and semiempirical data around 14–15MeV.

Spatial distribution of 222Rn concentrations and dose estimations in various waters

ABSTRACT In this article, the levels of 222Rn concentrations, annual effective doses, and excess lifetime cancer risk estimations were investigated for water samples in the city of Osmaniye, located in the southern part of Turkey. The measurements were conducted using a radon gas analyzer (AlphaGUARD PQ 2000 PRO). The arithmetic average of 222Rn concentrations was 0.44 Bq.L−1 with a geometric standard deviation of 0.19 and geometric average 0.41 Bq.L−1. The results obtained were compared with the findings of other studies. All measured radon concentrations were below the values recommended by the World Health Organization and the U.S. Environmental Protection Agency. The associated radiological parameters such as annual effective doses (AED) and excess lifetime cancer risk (ELCR) from consumption of these waters were calculated. The computed average annual effective doses for ingestion and inhalation as well as excess lifetime cancer risk were estimated to be 1.13 μSv.y−1, 1.10 μSv.y−1, and 3.95 × 10−6, respectively. 222Rn concentration, AED, and ELCR interpolated values of the region were determined and mapped using the Kriging method. The results of radon concentrations in this study provide a data baseline for future studies on subsequent evaluations of possible future environmental contamination of Osmaniye Province.