A new Am-Be PGNAA setup for element determination in aqueous solution

Area of Science:

• Nuclear Analytical Chemistry
• Applied Physics
• Environmental Monitoring

Background:

• Prompt-gamma neutron activation analysis (PGNAA) is a valuable technique for elemental determination.
• Optimizing PGNAA setups is crucial for enhancing detection limits, especially with low-activity neutron sources.
• Accurate elemental analysis in aqueous solutions is vital for environmental and industrial applications.

Purpose of the Study:

• To design and evaluate a novel PGNAA setup for elemental determination in aqueous samples.
• To improve the detection limits of PGNAA using a low-activity 241Am-Be neutron source.
• To validate the optimized setup through simulations and experimental analysis of chlorine.

Main Methods:

• A new PGNAA setup was designed utilizing a 300 mCi 241Am-Be neutron source and an uncooled BGO detector.
• A large polyethylene sample container and a Li2CO3 neutron shield were employed to optimize geometry and reduce neutron dose.
• Simulations for chlorine, mercury, and cadmium, followed by experimental determination of chlorine in aqueous samples, were conducted.

Main Results:

• The optimized PGNAA setup demonstrated improved element detection limits.
• A linear relationship was observed between chlorine concentration and characteristic peak counts, with a detection limit of 41.7 mg/L at 3600s.
• Simulations showed linear relationships for mercury and non-linear for cadmium concentration versus peak counts.

Conclusions:

• The designed PGNAA setup is effective for elemental analysis in aqueous solutions.
• Optimization of geometrical conditions significantly enhances detection capabilities, even with low-activity sources.
• The method shows promise for accurate and sensitive determination of elements like chlorine in real-world samples.