Accurate determination of trace radioactive nuclides (such as cesium-137, strontium-90, iodine-131, uranium, plutonium, etc.) in water is crucial in the fields of nuclear facility operation, environmental radiation monitoring, emergency response, and radioactive waste management. Due to the extremely low concentration of these nuclides in natural water bodies or discharged wastewater, it is difficult to obtain reliable data through direct measurement, and their activity concentration must be increased through pre-treatment enrichment. The radioactive water sample evaporation, concentration, and acid removal instrument is a professional equipment designed for this purpose. It can safely, efficiently, and automatically complete the concentration of large volume water samples and the removal of acid media, and is a key link in the radiochemical analysis process.
The core function of this instrument is to heat and evaporate radioactive water samples, which have risen to tens of liters, to a small volume under controlled conditions. At the same time, residual strong acids (such as nitric acid and hydrochloric acid) in the sample digestion process are removed by heating or ventilation, avoiding high acidity interference with subsequent co precipitation, ion exchange, or instrument measurements. The entire process needs to be carried out in a sealed, negative pressure, and high-efficiency filtering environment to prevent the escape of radioactive aerosols and ensure the safety of operators and laboratory environment.
Modern radioactive water sample evaporation, concentration, and acid recovery instruments usually have the following technical characteristics:
Fully enclosed negative pressure system: The cabinet is made of stainless steel or corrosion-resistant materials, maintaining a slight negative pressure inside, and equipped with double-layer HEPA high-efficiency filters to ensure that any volatile radioactive substances or acid mist are intercepted;
Multi channel independent processing: can process 4-12 samples simultaneously, with independent temperature control for each channel to avoid cross contamination;
Programmable intelligent control: supports staged heating (such as low-temperature concentration to prevent boiling, followed by high-temperature acid recovery), timing, automatic power-off, and liquid level alarm functions;
Anti corrosion design: The heating plate, pipeline, and inner cavity are all made of PTFE, quartz, or high-purity ceramic materials, which can withstand concentrated acid and high temperature environments;
Complies with nuclear safety regulations: meets the requirements of GB/T 14506.29-2010 Methods for Chemical Analysis of Silicate Rocks, EPA Method 900 series, and relevant IAEA guidelines.
Compared to traditional electric heating plate open evaporation, this equipment significantly improves operational safety and analytical accuracy. Open operation not only poses a risk of radioactive diffusion, but also is prone to sample splashing or nuclide adsorption loss due to local overheating; The concentration and acid recovery instrument minimizes sample loss and improves recovery rate by uniformly heating, gently boiling, and sealing the entire process. In addition, automated operation significantly reduces manual intervention and minimizes personnel exposure to radiation, in line with the ALARA principle of radiation protection.
In practical applications, this instrument is widely used for monitoring effluent from nuclear power plants, screening radioactive substances in drinking water, and emergency analysis of environmental water samples after accidents. For example, in the global ocean monitoring after the Fukushima nuclear accident, a large number of seawater samples were concentrated using such equipment to determine the ratio of ¹³ ⁴ Cs/¹³ ⁷ Cs, providing a basis for pollution tracing.
It is worth noting that after use, it is necessary to strictly clean and regularly check the integrity of the HEPA filter. Waste liquid residue should be classified and disposed of as radioactive waste, and cannot be discharged arbitrarily.
In short, although the radioactive water sample evaporation concentration acid analyzer is at the forefront of the analysis process, it directly affects the reliability and safety of the final results. It uses engineering control methods to build the first line of defense for radiation protection, and is an unknown but crucial "behind the scenes hero" in the nuclear and radiation safety system, providing solid technical support for safeguarding public health and ecological environment.