Phóng xạ tự nhiên trong đất tại huyện Thoulakhom của tỉnh Vientian, Lào=Natural radioactivity in the soil of Thoulakhom district in Vientiane province, Laos

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Tác giả: Hồng Khiêm Lê, Sonexay Xayheungsy

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Phát triển Khoa học & Công nghệ: Chuyên san Khoa học Tự nhiên, 2018

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Bộ sưu tập: Metadata

ID: 473527

Thêm vào giỏ

Bài báo này trình bày các kết quả khảo sát lần đầu về hoạt độ phóng xạ riêng của các mẫu đất lớp bề mặt được lấy tại các vị trí khác nhau tại huyện Thoulakhom của tính Vientiane của Cộng hòa Dân chủ Nhân dân Lào. Hoạt độ phóng xạ riêng của các đồng vị phóng xạ tự nhiên 226Ra, 232Th và 40K trong các mẫu đất được xác định bằng phổ kế gamma sử dụng detector bán dẫn siêu tinh khiết HPGe với độ phân giải năng lượng tốt. Hoạt độ phóng xạ riêng của các đồng vị phóng xạ tự nhiên tương ứng có giá trị trong khoảng từ 11,28 đến 31,46 với trung bình 21,76 Bq.kg-1 đối với của 226Ra, từ 7,13 đến 44,47 với trung bình 21,85 Bq.kg-1 đối với 232Th và từ 8,96 đến 581,52 với trung bình 112,89 Bq.kg-1 với 40K. Các kết quả cho thấy phóng xạ tự nhiên 226Ra, 232Th và 40K trong các mẫu đất lấy tại các vị trí khảo sát không gây ra nguy hiểm về phương diện phóng xạ.Results of the first investigation of the activity concentration of the surface soil samples collected at various locations of Thoulakhom district of Vientiane province of Laos People's Democratic Republic (PDR) are presented in this work. The activity concentration of the natural radionuclides 226Ra, 232Th and 40K in the soil samples were determined by gamma spectrometer using a high-energy resolution semiconductor detector HPGe. The activity concentrations of the natural radionuclides were in the range from 11.28 to 31.46 with the mean of 21.76 Bq.kg-1 for 226Ra, from 7.13 to 44.47 with the mean of 21.85 Bq.kg-1 for 232Th and from 8.96 to 581.52 with the mean of 112.89 Bq.kg-1 for 40K. These mean values of the activity concentration were lower than the average worldwide ones, which were 33, 45 and 420 Bq.kg-1 for 226Ra, 232Th, and 40K, respectively. The results indicate dthat the radiation hazard from natural 226Ra, 232Th, and 40K radionuclides in all investigated soil samples taken from area under investigation in this work was not significant.

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