Lanthanum bromide scintillation crystal gamma spectrometer detectors, compared to more traditional sodium iodide scintillation crystal gamma spectrometer detectors, have better energy resolution and detection efficiency. They are considered as a potential replacement for traditional sodium iodide detectors in the field of in-situ automatic monitoring of the ocean. However, they have drawbacks such as self-radioactivity, which can affect the measurement spectrum lines and subsequently impact the calculation of characteristic peak areas of the analyte nuclides and the results of activity analysis. This paper selects appropriate background subtraction methods for lanthanum bromide detectors' self-radioactivity and studies gamma spectral analysis methods for seawater, including spectrum smoothing, peak searching, and peak area fitting. Through simulated seawater gamma spectral data analysis experiments, it is demonstrated that the established spectral analysis methods can achieve accurate qualitative and quantitative analysis of radioactive nuclides in seawater, meeting the requirements for real-time and effective monitoring of the marine radioactive environment.
Dissolved oxygen is an important parameter for monitoring the water quality in the ocean. This study focuses on the research of compensation calibration methods for optical dissolved oxygen sensors, which possess advantages such as good robustness and high stability. Considering the issue of data drift caused by various environmental factors affecting optical sensors, the study specifically targets the drawbacks of multi-point nonlinear coupled compensation calibration methods. An optimized quantitative algorithm model is designed to simplify the operation process and enhance the accuracy of dissolved oxygen monitoring. The deviation between the reference value and the calibrated value of the sensor is within ±4μmol•L-1, and the goodness of fit reaches 0.99956.
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