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Advanced readout methods for superheated emulsion detectors.

F d'Errico1, A Di Fulvio1

  • 1Yale University School of Medicine, 333 Cedar Street, New Haven, Connecticut 06511, USA.

The Review of Scientific Instruments
|June 6, 2018
PubMed
Summary
This summary is machine-generated.

Superheated emulsions detect ionizing radiation by forming bubbles. An improved optical readout minimizes dead time and noise, offering a 6% readout uncertainty for radiation flux measurements.

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Area of Science:

  • Nuclear instrumentation and radiation detection.
  • Applied physics and materials science.

Background:

  • Superheated emulsions detect ionizing radiation via bubble formation, traditionally using acoustic methods with limitations.
  • Existing acoustic systems suffer from significant dead time and are sensitive to ambient noise.

Purpose of the Study:

  • To present an enhanced optical readout technique for superheated emulsion radiation detectors.
  • To improve measurement accuracy, reduce dead time, and minimize sensitivity to ambient noise.

Main Methods:

  • Utilized infra-red light scattering from neutron-induced bubbles in superheated C-318 emulsion.
  • Employed planar photodiodes and a low-noise signal-conditioning stage for optical signal acquisition.
  • Investigated the effect of external pressure on bubble size to mitigate shadowing.

Main Results:

  • Achieved a readout uncertainty of 6% (±1 SD) with 1000 bubbles in a 150 ml volume.
  • Demonstrated correlation between scattered light intensity and bubble density/size.
  • Showcased reduced dead time and improved noise immunity compared to acoustic methods.

Conclusions:

  • The improved optical readout enhances the performance of superheated emulsion detectors for radiation flux measurement.
  • Controlling bubble size via external pressure offers a method to optimize readout and minimize shadowing effects.
  • This technique provides a sensitive and accurate method for radiation detection.