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Gas Chromatography: Types of Detectors-II

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In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...

High-Performance Liquid Chromatography: Types of Detectors

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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...

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Related Experiment Video

Updated: Jun 28, 2026

Synthesis and Characterization of High c-axis ZnO Thin Film by Plasma Enhanced Chemical Vapor Deposition System and its UV Photodetector Application

Synthesis and Characterization of High c-axis ZnO Thin Film by Plasma Enhanced Chemical Vapor Deposition System and its UV Photodetector Application

Published on: October 3, 2015

Ionic Conduction-Based Polycrystalline Oxide Gamma Ray Detection - Radiation-Ionic Effects.

Thomas Defferriere¹, Ahmed Sami Helal^2,3, Ju Li^1,2

¹Department of Material Science and Engineering, MIT, Cambridge, MA, 02139, USA.

Advanced Materials (Deerfield Beach, Fla.)

|February 21, 2024

Summary

This summary is machine-generated.

Newly discovered radiation-ionic effects in ceramics enable sensitive gamma-ray detection. This breakthrough in metal oxide functional ceramics offers opportunities for low-power, miniaturizable solid-state radiation detectors.

Keywords:

electroceramics polycrystalline radiation detection radiation‐ionic solid electrolytes

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Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera

Published on: January 30, 2020

Area of Science:

Materials Science
Solid-state Physics
Ceramic Engineering

Background:

Opto-ionic effects in metal oxides offer novel functional ceramic applications.
Previously, opto-ionic effects were observed in thin films under ultraviolet (UV) irradiation.
Generalizing this to bulk materials for radiation detection is a new frontier.

Purpose of the Study:

To investigate and generalize the opto-ionic effect to a radiation-ionic effect for gamma-ray detection in bulk ceramic materials.
To demonstrate the potential of lightly doped Gadolinium-doped Cerium Oxide (Gd-doped CeO2) for radiation detection applications.

Main Methods:

Utilized lightly doped Gd-doped CeO2, a polycrystalline ion-conducting ceramic.
Exposed the ceramic to 60Co gamma-ray (1.1 and 1.3 MeV) radiation near room temperature.
Measured the resistance ratio change and ionic current response under low electrical fields (< 2 V cm-1).

Main Results:

Observed a significant resistance ratio change of approximately 10^3.
Demonstrated a reversible response in ionic current upon exposure to gamma-ray radiation.
Attributed the effect to the passivation of space charge barriers at grain boundaries, modulating ionic carrier flow.

Conclusions:

The radiation-ionic effect in bulk ceramics enables sensitive gamma-ray detection.
This phenomenon allows for the development of inexpensive, sensitive, low-power, and miniaturizable solid-state devices.
Potential applications include radiation detectors for geothermal drilling, small modular reactors, nuclear security, and waste management, especially in harsh environments.