Phương pháp k-zero trong phân tích kích hoạt neutron (K0

Phương pháp k-zero trong phân tích kích hoạt neutron (K0 - NAA)

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Tác giả: Trường Sơn Trương

Ngôn ngữ: Vie

Ký hiệu phân loại: 539 Modern physics

Thông tin xuất bản: Tạp chí Khoa học Trường Đại học Sư phạm Thành phố Hồ Chí Minh , 2021

Mô tả vật lý: 2236-2242

Bộ sưu tập: Metadata

ID: 413565

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Phân tích kích hoạt neutron (NAA) là một phương pháp phân tích vật lí hạt nhân không hủy mẫu với độ nhạy và độ chính xác cao có khả năng giải quyết nhiều bài toán thực tế trong nghiên cứu địa chất, khảo cổ, nông - sinh - y, vật liệu, môi trường... Trong NAA, có 3 loại nguồn neutron thường được sử dụng nguồn đồng vị, máy gia tốc và lò phản ứng. Sử dụng nguồn neutron từ lò phản ứng hạt nhân nghiên cứu có thông lượng neutron cao, vì vậy đây là nguồn neutron cho NAA có nhiều ưu điểm nhất trong 3 loại nguồn kể trên. NAA có các phương pháp chuẩn hoá khác nhau tuyệt đối, tương đối, chuẩn đơn và k-zero, trong đó phương pháp k-zero của NAA (k0-NAA) được đánh giá là phương pháp ổn định (về mặt sai số hệ thống) có độ nhạy và độ chính xác cao, đặc biệt khi nghiên cứu một số đối tượng như bài toán môi trường, địa chất, khảo cổ... quan tâm đặc biệt đến mối tương quan giữa các nguyên tố cho nhiều mẫu nghiên cứu thì thể hiện sự ưu việt vượt trội của phương pháp. Chính vì vậy mà phương pháp k0-NAA đã được chọn và sử dụng ở nhiều nơi trên thế giới như một phương pháp chuẩn (tham khảo) dùng để phê chuẩn (validation) cho các mẫu chuẩn - tham khảo (standard reference materials) và cũng là phương pháp chính trong nhiều đối tượng nghiên cứu., Tóm tắt tiếng anh, Neutron activation analysis (NAA) is a method of non-destructive nuclear physics analysis with high sensitivity and accuracy that is capable of solving many practical problems in geological, archaeological, agricultural research, in bio-medicine, materials, environment as well. In NAA, three types of neutron sources are commonly used isotopic sources, accelerators, and reactors. This study used a neutron source from a research nuclear reactor with a high neutron flux, a neutron source for NAA with the most advantages of the three sources. NAA has different standardization methods absolute, contrast, single standard, and k-zero, where the k-zero method of NAA (k0-NAA) is evaluated as a stable (in terms of error) method with high sensor and accuracy, especially when studying environmental, geological, archeological, problems. Given the relationship between prefixes for many samples, this methodmay demonstrate the superiority of the method. That is why the k0-NAA method has been selected and used widely as a standard method (reference) used for validation, standard reference materials, and the main method in many studies.

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