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Mass Analyzers: Common Types01:19

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...
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Updated: May 19, 2026

A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space
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Published on: February 1, 2016

A neutron track etch detector for electron linear accelerators in radiotherapy.

Branko Vukovic1, Dario Faj, Marina Poje

  • 1Department of Physics, University of Osijek; Osijek, Croatia.

Radiology and Oncology
|August 31, 2012
PubMed
Summary

A new neutron dosimeter effectively measures unwanted neutron radiation during medical radiotherapy. This technology helps improve patient safety by quantifying neutron dose rates from linear accelerators.

Keywords:
electron linear acceleratorneutron dose equivalentphotoneutrontrack etch detector

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Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
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Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
07:31

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Published on: May 9, 2014

Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Nuclear Instrumentation

Background:

  • Medical linear accelerators (LINACs) over 10 MeV produce unwanted fast neutron contamination in therapeutic X-ray beams.
  • This neutron contamination arises from photon interactions with high-Z materials in the LINAC target and head.
  • Such neutron radiation poses a potential risk to patients undergoing radiotherapy.

Purpose of the Study:

  • To develop and calibrate a neutron dosimeter for measuring unwanted neutron contamination in medical radiotherapy.
  • To quantify the neutron dose rates generated by a 15 MV Siemens Mevatron linear accelerator.
  • To assess neutron dose rates within the treatment beam and in the vicinity of the LINAC room.

Main Methods:

  • Utilized a neutron dosimeter comprising an LR-115 track etch detector and a BN-1 boron foil converter.
  • Calibrated the dosimeter using thermal neutrons from a nuclear reactor.
  • Applied the calibrated dosimeter to measure neutron dose rates in a 15 MV Siemens Mevatron photon radiotherapy beam and surrounding areas.

Main Results:

  • Measured a neutron dose rate of 1.96 Sv/h within the photon beam of the 15 MV Siemens Mevatron.
  • Determined a neutron dose rate of 0.62 μSv/h outside the LINAC treatment room.
  • Developed a method to determine effective neutron detector response considering energy-dependent cross-sections and broad neutron spectra.

Conclusions:

  • The developed neutron dosimeter is effective for quantifying neutron contamination in radiotherapy.
  • The measurements provide crucial data for assessing and mitigating neutron radiation exposure in clinical settings.
  • This dosimetry approach contributes to enhancing patient safety in high-energy photon radiotherapy.