Earticle

초록

영어

The development of spectroscopic gamma-ray detectors requires the optimization of several factors, such as the growth of a relatively thick (>1 mm), defect-free, and compositionally uniform radiation-sensitive medium, the extraction of radiation-induced carriers from the medium without loss, a good response linearity between the radiation energy and the number of collected carriers, and the long-term stability in an ambient environment. We review recent advances in the structural design of novel gamma detector systems based on nanoparticles (NPs), including nanocrystals (NCs). The use of NPs in gamma-ray detection has been attracting great attention recently, due to their enhanced optical properties, favorable carrier multiplication condition, low-cost fabrication, and improved chemical properties with stability. Many different fabrication approaches have been adopted for indirect and direct detectors. The indirect detector can be realized by both luminescent NCs and non-luminescent (or weakly luminescent) NPs with high atomic numbers. A proper polymerization process leads to a uniform and high loading of NPs in a large volume, which protects the NPs from oxidation. Furthermore, additional types of composites, including fluorescent dyes or cosolvent, may facilitate efficient charge carrier transfer to linearly convert the incident gamma-ray energy into the number of scintillation photons with negligible loss. The direct detector is implemented by interconnecting NCs with high packing density and mitigating crack formation to extract radiation-induced charge carriers to electrodes across millions of NCs and interfaces. In addition, controlling the NC size, ligand chain length, and NC dispersion state determines the leakage current level. To the best of our knowledge, several studies of NC-based gamma-ray detectors have recently demonstrated gamma spectroscopy capability in the last 10 years, showing improved energy resolution comparable to single-crystal gamma-ray detectors. This review will provide an in-depth overview of the current status and challenges in developing NP-based gamma detectors.

목차

ABSTRACT
Introduction
Nanocomposite Indirect Detectors
1. Fabrication of Nanocomposite Scintillator
2. Luminescent Nanocrystals
3. Non-Luminescent (or Weakly Luminescent) Nanoparticles
Nanocomposite Direct Detectors
1. Assembly of Nanocomposite Direct Detectors
2. Nanocomposite Direct Detector as a High-Resolution Gamma-Ray Detector
Summary and Outlook
Article Information
References

키워드

저자

• Jihwan Boo [ Department of Energy Systems Engineering, Seoul National University, Seoul, Republic of Korea ]
• Ill Hyuk Han [ Department of Energy Systems Engineering, Seoul National University, Seoul, Republic of Korea ]
• Geehyun Kim [ 1Department of Energy Systems Engineering, Seoul National University, Seoul, Republic of Korea;/Department of Nuclear Engineering, Seoul National University, Seoul, Republic of Korea;/Institute of Engineering Research, Seoul National University, Seoul, Republic of Korea ] Corresponding Author

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  방사선방어학회지 [Journal of Radiation Protection and Research]

• 간기

  계간

• pISSN

  2508-1888

• 수록기간

  1976~2026

• 등재여부

  KCI 등재,SCOPUS

• 십진분류

  KDC 559 DDC 629