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Mass Analyzers: Common Types

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...

Mass Analyzers: Overview

Mass Analyzers: Overview

The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...

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Related Experiment Video

Updated: Jun 23, 2025

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator

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Implementation of an ionization chamber array for linear accelerator monthly dosimetry QA.

Sameer Taneja¹, David L Barbee¹

¹Department of Radiation Oncology, New York University Langone Medical Center, New York, New York, USA.

Journal of Applied Clinical Medical Physics

|June 26, 2024

Summary

The IC Profiler (ionization chamber array) offers accurate and efficient monthly dosimetry quality assurance for linear accelerators. Optimized gain settings significantly improve its accuracy for beam output measurements.

Keywords:

IC Profiler dosimetry linear accelerator QA monthly QA

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Last Updated: Jun 23, 2025

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Area of Science:

Medical Physics
Radiation Oncology
Dosimetry

Background:

The IC Profiler (ICP) is an ionization chamber (IC) array for linear accelerator (LINAC) dosimetry.
Previous studies characterized ICP response, but implementation in monthly QA is less explored.
This study assesses ICP accuracy and feasibility for comprehensive monthly LINAC QA.

Purpose of the Study:

Quantify ICP accuracy for LINAC beam output measurements.
Identify variables impacting ICP accuracy.
Demonstrate ICP feasibility for all recommended monthly dosimetry QA procedures.

Main Methods:

Performed 1985 output measurements on six Varian LINACs using ICP and conventional IC.
Analyzed ICP accuracy by comparing measurements with IC.
Investigated effects of gain settings, calibrations, baselining, machine, and energy on accuracy.

Main Results:

Optimized gain settings improved ICP output accuracy to -0.02% (0.38%).
ICP accuracy was independent of calibrations and baselining but showed machine/energy dependence.
ICP measurements for constancy, wedge factors, and gating showed stability and efficiency, halving QA time.

Conclusions:

The IC Profiler is a feasible and efficient tool for dosimetric LINAC monthly QA.
Optimized gain settings are crucial for maximizing ICP accuracy.
ICP integration can significantly reduce QA time while maintaining measurement quality.