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Updated: Jul 6, 2026
06:28
Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
Published on: January 30, 2020
Development of a low-level background gamma-ray spectrometer by KRISS
K B Lee1, Tae Soon Park, Jong Man Lee
1Korea Research Institute of Standards and Science, Daejeon 305-600, Republic of Korea. lee@kriss.re.kr
Summary
A new low-background gamma-ray spectrometer was developed for certifying reference materials. This high-efficiency system significantly reduces background radiation for accurate measurements.
Area of Science:
- Nuclear Instrumentation
- Metrology
- Environmental Science
Background:
- Accurate activity certification of natural-matrix and environmental reference materials is crucial.
- Existing gamma-ray spectrometry systems face challenges with background radiation.
- Need for high-efficiency, low-background systems for precise measurements.
Purpose of the Study:
- To develop and characterize a novel low-background, high-efficiency gamma-ray spectrometric system.
- To enable precise activity certification of certified reference materials (CRMs) and environmental reference materials (RMs).
- To minimize background radiation from natural radioactivity, neutrons, and cosmic muons.
Main Methods:
- Development of a gamma-ray spectrometer incorporating a low-background, high-purity germanium detector (120% relative efficiency).
- Implementation of extensive shielding: a 10-ton passive shielding cabinet and three 50-mm plastic scintillation detector plates.
- Shielding designed to mitigate background from natural radioactivity, neutrons, and cosmic muons.
Main Results:
- The developed system achieves a significantly low background rate.
- Measured background rate for the energy range 50-3000 keV is 1.72 s⁻¹.
- The system effectively suppresses background from various sources including cosmic muons.
Conclusions:
- The new gamma-ray spectrometric system meets the requirements for low-background and high-efficiency measurements.
- This system is suitable for the accurate activity certification of natural-matrix and environmental reference materials.
- The advanced shielding design contributes to the system's superior performance in background reduction.
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