Simulation analysis of the protective performance of barium sulfate mortar against positron nuclide γ-rays
10.13491/j.issn.1004-714X.2025.02.011
- VernacularTitle:硫酸钡砂浆对正电子核素γ射线防护性能模拟分析
- Author:
Zhiqiang XU
1
;
Huaixin NI
2
;
Jiwu GENG
1
;
Lichun LI
1
;
Zaoqin ZHANG
1
;
Shibiao SU
1
;
Meixia WANG
1
;
Ming LIU
1
Author Information
1. Guangdong Province Hospital for Occupational Disease Prevention and Treatment, Guangzhou 510300 China.
2. Shandong Xinning Detection Technology Co., Ltd, Jinan 250100 China.
- Publication Type:OriginalArticles
- Keywords:
Positron nuclide;
Barium sulfate mortar;
Half-value layer;
Specific lead equivalent
- From:
Chinese Journal of Radiological Health
2025;34(2):209-213
- CountryChina
- Language:Chinese
-
Abstract:
Objective To obtain the protective performance parameters of barium sulfate mortar against positron nuclide γ-rays, provide reference data for precise shielding calculations, and guide the design, evaluation, and construction of radiation shielding. Methods The FLUKA program was used to build a model for simulating the dose equivalent rate variation around points of interest under the irradiation of the most commonly used positron nuclide 18F with changes in the thicknesses of lead and barium sulfate mortar. The transmission curves of lead and barium sulfate mortar were fitted, and the half-value layer (HVL) and lead equivalence of barium sulfate mortar were calculated based on the fitted curves. Results The ambient dose equivalent rate coefficient of positron nuclide 18F was 1.339 4×10−1 μSv·m2/MBq·h and the HVL for lead was 4.037 mm, with deviations of 0.043% and 1.53% compared to the values provided in the AAPM Report No. 108, respectively. The HVLs for γ-rays produced by 18F, using barium sulfate mortar with apparent densities of 4.20, 4.00, and 3.90 g/cm3 mixed with 35.2-grade cement in a 4∶1 mass ratio, were 2.914, 2.969, and 3.079 cm, respectively. The lead equivalences were 0.1385, 0.1360, and 0.1311 mmPb/mm, respectively. Conclusion The three types of barium sulfate mortar can provide good protection against γ-rays in positron imaging locations. As the apparent density of barium sulfate increases, its protective effect improves slightly but remains significantly better than common construction materials like concrete and solid bricks.
