A new digital 4πγ system with a NaI well-type detector at LMR-CNEA

Area of Science:

• Nuclear physics
• Radiochemistry
• Metrology

Background:

• Accurate radioactivity quantification is crucial for nuclear science and applications.
• Existing methods may have limitations in efficiency and precision for certain sample types.
• Implementation of advanced detection systems is needed for improved metrological capabilities.

Purpose of the Study:

• To implement and validate a 4πγ integral counting system for radioactivity measurements.
• To develop and utilize Monte Carlo simulations for accurate detection efficiency determination.
• To establish a reliable method for calculating source activities and their uncertainties.

Main Methods:

• Installation of a 4πγ integral counting system with a NaI(Tl) well-type detector and digital interface.
• Monte Carlo simulations to compute energy-dependent detection efficiency.
• Development of a computer code for data analysis, dead-time correction, and activity calculation.
• Measurement of ampoules containing ¹¹³Sn, ¹⁹²Ir, and ¹³¹I solutions.

Main Results:

• Successful implementation of the 4πγ integral counting system.
• Calculation of total detection efficiencies for ampoules and point sources, accounting for all decay branches.
• Validated computer code for accurate source activity and uncertainty determination.
• Demonstrated capability to measure activities of various radionuclides.

Conclusions:

• The developed 4πγ integral counting system provides a robust platform for precise radioactivity measurements.
• The combination of Monte Carlo simulations and dedicated software ensures accurate determination of source activities.
• This system enhances metrological capabilities at LMR-CNEA for radionuclide analysis.