Nghiên cứu khảo sát đặc trưng đo liều gamma của LiAlO2=Study on gamma dosimetry characteristics of LiAlO2

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Tác giả: Đức Kỳ Bùi, Thị Thu Hà Nguyễn, Văn Giáp Trịnh

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Khoa học và Công nghệ Việt Nam, 2025

Mô tả vật lý: tr.45849

Bộ sưu tập: Báo, Tạp chí

ID: 478416

Thêm vào giỏ

Radiation dosimetry materials are being studied by scientists to create passive dosimeters in environment dosimetry as well as personal dosimetry. The research team conducted experimental studies and investigated the characteristics of LiAlO2 material for dosimetry applications. On the basis of analysis and synthesis of LiAlO2, preliminary investigation of dosimetry characteristics, including background, linearity, uniformity, the sensitivity of thermoluminescent (TL) signal, reusability, dose-response and fading of TL signals after LiAlO2 being irradiated by gamma. The results show that LiAlO2 has a detection limit of 6.09 nC, uniformity of 6.98%. The investigation of the 2-40 mGy dose range showed good linearity, with a fluctuation of 8.8% between the measured dose and the irradiation dose. The fading of the TL signal maintained 90 days after being irradiated was 6%. The results of the tests measuring the reusability of the LiAlO2 powder sample show a standard deviation of 3.63% from 10 measurements. The distribution of the measurements is quite uniform, and the sensitivity remains almost unchanged during use, indicating a high reusability. The results of the research and investigation lead to the conclusion that LiAlO2 has the potential for application in radiation dose measurement.Vật liệu đo liều bức xạ đang được các nhà khoa học quan tâm nghiên cứu, nhằm phát triển thành các liều kế đo tích lũy ứng dụng trong đo liều môi trường, cũng như đo liều cá nhân. Nhóm tác giả đã tiến hành các bài thực nghiệm nghiên cứu, và khảo sát đặc trưng của vật liệu LiAlO2 ứng dụng trong đo liều. Trên cơ sở phân tích và thực nghiệm chế tạo ra LiAlO2 đơn pha gamma, nghiên cứu này bước đầu khảo sát các đặc trưng đo liều bao gồm: giá trị phông, độ tuyến tính, độ đồng đều, độ nhạy tín hiệu nhiệt phát quang (TL), khả năng tái sử dụng/đáp ứng liều cũng như đặc trưng suy giảm tín hiệu nhiệt phát quang sau khi vật liệu LiAlO2 được chiếu bức xạ gamma. Kết quả chỉ ra rằng, vật liệu LiAlO2 có ngưỡng nhạy 6,09 nC, độ đồng đều 6,98%. Khảo sát dải liều 2-40 mGy cho thấy, độ tuyến tính tốt với thăng giáng giữa liều đo và liều chiếu là 8,8%. Độ suy giảm tín hiệu được lưu giữ 90 ngày sau khi chiếu xạ là 6%. Kết quả các phép đo kiểm tra khả năng tái sử dụng của mẫu bột LiAlO2 với độ lệch chuẩn của 10 phép đo là 3,63%. Giá trị phân bố các phép đo khá đồng đều, có độ nhạy hầu như không thay đổi trong quá trình sử dụng, có khả năng tái sử dụng cao. Từ những kết quả đã nghiên cứu và khảo sát có thể kết luận rằng, LiAlO2 có khả năng ứng dụng trong đo liều bức xạ.

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