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A model for photon detection and dosimetry with superheated emulsions
1Yale University School of Medicine, Department of Therapeutic Radiology, New Haven, Connecticut 06511, USA. francesco.derrico@yale.edu
Medical Physics
|March 16, 2000
Summary
This study presents a model for photon detectors using superheated emulsions. Octafluoropropane (R-218) offers room-temperature photon sensitivity and stable air-kerma response, ideal for dosimetry.
Area of Science:
- Nuclear physics and detector technology.
- Materials science and thermodynamics.
Background:
- Superheated emulsions are sensitive to photons.
- Understanding their response is crucial for detector development.
Purpose of the Study:
- To develop a model for predicting the photon response of superheated emulsion detectors.
- To identify optimal materials and operating conditions for photon detection.
Main Methods:
- Utilizing a nondimensional thermodynamic quantity (reduced superheat) to define operating temperature.
- Applying mass energy absorption coefficients to determine energy dependence.
- Estimating vaporization energy using thermal spike theory.
Main Results:
- Reduced superheat successfully identifies photon sensitization temperatures.
- Energy dependence of photon response can be determined.
- Octafluoropropane (R-218) emulsions show photon sensitivity at room temperature with constant air-kerma response.
- Low effective atomic number halocarbons exhibit superior dosimetric properties.
Conclusions:
- The model provides design criteria for superheated emulsion photon detectors.
- Light halocarbons, particularly octafluoropropane, are promising for sensitive and stable photon detection applications.
