An introduction to γ(3) a new versatile ultralow background gamma spectrometer. Background description and analysis

Area of Science:

• Nuclear spectrometry
• Low-background physics
• Detector technology

Background:

• Ground-level installation requires advanced background reduction techniques.
• Minimizing background is crucial for high-sensitivity measurements.
• Existing setups may have limitations in background suppression.

Purpose of the Study:

• To present the design and background performance of the γ(3) spectrometry setup.
• To demonstrate the effectiveness of state-of-the-art background reduction techniques.
• To validate the suitability of the setup for sensitive measurements at ground level.

Main Methods:

• Utilized three High-Purity Germanium (HPGe) detectors for high efficiency and coincidence measurements.
• Implemented a multi-layered shield including lead, borated polyethylene, and a cosmic ray veto.
• Incorporated a radon-free gas injection system for further background suppression.

Main Results:

• Achieved a normalized background count rate of 4.4 counts per minute per kg of Ge (40-2500 keV).
• Demonstrated effective background reduction through advanced shielding and radon mitigation.
• Validated the performance of the cosmic veto and radon-free gas system.

Conclusions:

• The γ(3) setup is a versatile, high-sensitivity spectrometry platform with significantly reduced background noise.
• The implemented techniques are effective for low-background measurements at ground level.
• The setup is well-suited for applications requiring high detection efficiency and coincidence measurements.