Xây dựng hệ đo gamma đơn kênh ứng dụng kỹ thuật truyền phát không dây

0 Người đánh giá. Xếp hạng trung bình 0

Tác giả: Viết Hải Lại, Đức Phụng Vương

Ngôn ngữ: Vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học - Đại học Thủ Dầu Một, 2020

Mô tả vật lý: 74-82

Bộ sưu tập: Metadata

ID: 408060

Thêm vào giỏ Liên kết toàn văn

Phương pháp gamma truyền qua dựa trên nguyên lý suy giảm cường độ chùm tia gamma khi truyền qua vật chất được biết đến là một trong những kỹ thuật hữu ích cho phép kiểm tra trực tiếp các tháp và đường ống công nghiệp. Trong đó, hầu hết việc truyền tín hiệu từ đầu dò đến máy đo sử dụng cáp dẫn đến nhiều khó khăn trong việc lắp đặt và vận hành hệ đo tại hiện trường. Nhằm tăng tính linh hoạt, hệ đo gamma đơn kênh ứng dụng công nghệ truyền phát không dây trong điều khiển và thu nhận tín hiệu đã được đề xuất trong bài báo này. Hệ đo gồm các khối điện tử như khối cao thế, khối khuếch đại, khối cắt ngưỡng, khối vi điều khiển và khối truyền phát không dây. Thí nghiệm khảo sát phổ gamma của nguồn 60Co và 137Cs sau đó được thực hiện với khoảng cách giữa hệ đo và điểm đo khoảng 230 m. Kết quả cho thấy bề rộng ở một nửa giá trị cực đại ứng với các đỉnh năng lượng lần lượt là FWHM1173KeV = 9,4% và FWHM1332KeV = 7.6% đối với phổ gamma 60Co và FWHM663KeV = 15,4% đối với phổ gamma 137Cs. Kết quả khảo sát sự ổn định của hệ đo trong 10 giờ cho thấy độ trôi đỉnh năng lượng của nguồn 60Co là khoảng 2,3%., Tóm tắt tiếng anh, The gamma transmission method based on the principle of reducing the intensity of the gamma rays when passing through a material is well-known as one of the useful techniques for industrial system inspections. In particular, most of the signal transmission from a detector to a spectrometer using cables leads to many difficulties in installing and operating the measuring system in the field conditions. For enhanced flexibility, a single-channel gamma analyzer applying the wireless transfer technique in controlling and receiving signals was proposed in this paper. The measuring system consists of electronic units such as high-voltage, amplifier, discriminator, microcontroller, and wireless transfer. The experiment of surveying the gamma spectrum of source 60Co and 137Cs was then carried out with the distance between the measuring system and the measuring point about 200 m. The results show that the full width at half maximum corresponding to the energy peaks is respectively FWHM1173KeV = 9.4% and FWHM1332KeV = 7.6% for 137Co gamma spectrum and FWHM663KeV = 15.4% for 137Cs gamma spectrum. Results of the stability survey of the measuring system for 10 hours show that the peak energy drift of the 60Co source is about 2.3%.

1. Đọc trực tuyến

1. Đọc trực tuyến

Tạo bộ sưu tập với mã QR