GB/T 35190-2017 in English
VALIDDetermination of 131 I in sea water―β counting method
- Issued on:2017-12-29
- Implemented on:2018-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 35190-2017海水中碘-131的测定 β计数法》由TC283（全国海洋标准化技术委员会）归口，主管部门为自然资源部(海洋)。
Introduction
Interpretation of the National Standard of the People's Republic of China GB/T 35190—2017
| Standard Dimensions | Scope | Method Principle | Applicability |
|---|---|---|---|
| Measurement Object | Iodine-131 in Seawater (^131I) | β counting method, using low background β measuring instrument | Applicable to seawater and saline bodies |
| Core Steps | Sample collection, enrichment, extraction, precipitation, source preparation | Combination of chemical separation and radiation detection | Environmental Monitoring and Nuclide Analysis |
Background of Standard Formulation
With the increasing demand for marine environmental protection, the monitoring of radionuclides is becoming increasingly important. As a tracer with a short half-life (8 days), iodine-131 is widely used in medicine, environmental science and other fields. The formulation of this standard aims to standardize its determination method in seawater and ensure the accuracy and reliability of data.
Technology Evolution Analysis
Traditional radioactive detection methods usually rely on complex and expensive equipment, while the beta counting method significantly improves sensitivity and accuracy through chemical separation and enrichment. This standard adopts a number of innovative technologies:
- Ion exchange resin enrichment: Efficient enrichment of iodide using anion exchange columns.
- Extraction and precipitation separation: High-purity separation is achieved through carbon tetrachloride extraction and silver nitrate precipitation.
- Low background β measurement instrument: ^137Cs standard source calibration to improve detection efficiency.
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