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Related Concept Videos

IR Frequency Region: Fingerprint Region01:03

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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Technical Note: Robust individual thermoluminescence dosimeter tracking using optical fingerprinting.

Daili Shang1, Wenbo Gu1, Angelia Landers1

  • 1Department of Radiation Oncology, University of California-Los Angeles, Los Angeles, CA, 90095, USA.

Medical Physics
|November 3, 2019
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Summary

Optical fingerprinting uniquely identifies Thermoluminescent Dosimeter (TLD) chips, overcoming variability issues. This cost-effective method ensures accurate TLD tracking and dosimetry for reliable radiation measurements.

Keywords:
TLDfingerprintingrobustnessthermoluminescent dosimetertracking

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Area of Science:

  • Medical Physics
  • Radiation Dosimetry
  • Materials Science

Background:

  • Thermoluminescence dosimeters (TLDs), specifically TLD-100 chips, offer advantages like low cost and reusability.
  • However, TLD-100 chips exhibit significant inter-detector variability, necessitating individual calibration for precise dose assessment.
  • Robust individual TLD tracking is crucial for accurate dosimetry applications.

Purpose of the Study:

  • To develop and validate an optical fingerprinting method for robust identification of individual TLD-100 chips.
  • To enhance the reliability of TLD management and individual calibration processes.

Main Methods:

  • Captured 752 images of 376 TLD-100 chips using a digital microscope to create a feature library.
  • Employed median intensity thresholding for image segmentation and affine transformation for image registration.
  • Stored TLD fingerprints in an Elasticsearch database and tested identification accuracy over 20 months, including dose response tests.

Main Results:

  • Achieved a 100% true positive rate for TLD identification upon initial library creation.
  • Maintained a 99% true positive match rate after 20 months, with no false positives, demonstrating long-term stability.
  • TLDs showed high self-consistency in dose-response tests, with R² values between 0.988 and 1.

Conclusions:

  • The unique surface textures of TLD-100 chips are sufficient for accurate identification via optical fingerprinting.
  • This optical fingerprinting method provides an inexpensive and robust solution for managing TLDs.
  • The technique supports accurate individual calibration and reliable dosimetry in radiation applications.