“痕量”科研新战场：能测到“宇宙级微弱信号”的仪器如何破解"卡脖子"难题？

Core Viewpoint - The article emphasizes the importance of accurately detecting low-concentration radioactive substances in various fields such as nuclear science, environmental monitoring, and biomedicine, highlighting the advancements made by a domestic instrument brand in achieving precise measurements [1][2]. Group 1: Detection Challenges - Detecting low-concentration radioactive materials is a complex challenge due to background noise interference, which can obscure critical signals [2]. - Traditional liquid scintillation counters have background values ranging from 80 to 150 counts per minute (cpm), which can hinder detection in various applications [2]. Group 2: Technological Innovations - The FY2700-0Z instrument has achieved a background counting rate as low as 1 cpm in the tritium (³H) range, significantly enhancing detection precision [4][5]. - The instrument employs a lead-copper composite shielding system and advanced electronic signal discrimination to actively suppress non-target radioactive signals [4]. - TDCR quenching correction technology allows for automatic calibration of interference from impurities, maintaining detection errors within ±1.2 Bq/kg [7]. - An intelligent sampling system enables the processing of up to 40 samples simultaneously, eliminating human error in the detection process [8]. Group 3: Application Areas - The FY2700-0Z can analyze various environmental samples for low-level isotopes such as ³H and ¹⁴C, with applications in nuclear industry, agriculture, biomedicine, and environmental science [13][14]. - Specific use cases include detecting tritium in imported food, monitoring radioactive levels in seawater, and assessing the safety of products in compliance with environmental regulations [16][17]. Group 4: Conclusion - The development of the FY2700-0Z represents a significant advancement in China's high-end scientific instrument innovation, addressing the critical need for precise detection in various scientific fields [21].