Beta-sensitive intraoperative probes utilizing dual, stacked lon-implanted-silicon detectors: Proof of principle

Raymond R. Raylman, Richard L. Wahl

Research output: Contribution to journalArticle

Abstract

Successful development of a beta-sensitive intraoperative probe requires that the device be capable of selectively rejecting or reducing signals from background sources of photons. To address this problem we have designed and tested a unique stacked, dual solid-state detector probe. The first ion-implantedsemiconductor wafer detects a combination of beta particles and background photons, and the second wafer detects just the photon flux, due to the beta shielding effects of the first wafer. Using the data acquired from a positron-emitting source (18F), four methods of photon correction were tested. The scheme which incorporated a weighted subtraction of the data from the photon monitoring detector from the front detector was found to optimize performance. Sensitivity to beta particles was 4121.0 ± 52.3 cps//uCi, and the selectivity index was 0.99. Monte Carlo simulations revealed that these values are close to the theoretically optimal values possible, given the probe and source geometries. Additionally, a simulated tumor search utilizing an anthropomorphic torso phantom demonstrated the excellent potential of this device to intraoperatively localize sources of radiotracer-avid disease, such as malignant tumors. In summary, a dual, stacked ion-implanted-silicon detector beta-sensitive probe system has been developed and successfully tested.

Original languageEnglish (US)
Pages (from-to)1730-1736
Number of pages7
JournalIEEE Transactions on Nuclear Science
Volume45
Issue number3 PART 4
StatePublished - 1998
Externally publishedYes

Fingerprint

Silicon detectors
Photons
probes
detectors
photons
silicon
beta particles
wafers
Detectors
Tumors
tumors
torso
Ions
Positrons
subtraction
Shielding
shielding
positrons
ions
selectivity

Keywords

  • Beta probes
  • Positrons
  • Radiation detectors

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Nuclear Energy and Engineering

Cite this

Beta-sensitive intraoperative probes utilizing dual, stacked lon-implanted-silicon detectors : Proof of principle. / Raylman, Raymond R.; Wahl, Richard L.

In: IEEE Transactions on Nuclear Science, Vol. 45, No. 3 PART 4, 1998, p. 1730-1736.

Research output: Contribution to journalArticle

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