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Bubble detector investigations in China.

Shi-Lun Guo¹

¹China Institute of Atomic Energy, P.O. Box 275 (96), Beijing 102413, China. guosl@iris.ciae.ac.cn

Radiation Protection Dosimetry

|June 20, 2006

Summary

Bubble detectors, developed since 1989, are effective for neutron dosimetry and detecting high-energy heavy ions. Their neutron response and heavy ion identification capabilities are detailed, highlighting energy loss as a key parameter.

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Area of Science:

Nuclear physics
Radiation detection
Particle physics

Background:

Bubble detectors have been researched since 1989, with five types developed.
LET thresholds range from 0.05 to 6.04 MeV mg(-1) cm(-2) at 25°C.

Purpose of the Study:

Investigate the neutron response of bubble detectors made with freon-12.
Explore the use of bubble detectors for monitoring and identifying high-energy heavy ions, including cosmic radiation.
Identify the critical parameters for track registration in bubble detectors.

Main Methods:

Tested bubble detectors with mono-energetic neutrons from 20 keV to 19 MeV.
Investigated high-energy heavy ion tracks in large-size bubble detectors.
Analyzed the critical rate of energy loss as the key parameter for track registration.

Main Results:

The effective threshold energy for neutron detection is approximately 100 keV at 28°C.
The neutron response above the threshold is approximately 1.5 x 10(-4) (bubble cm(-2))/(n cm(-2)).
Three approaches for identifying high-energy heavy ions using bubble detectors were proposed.

Conclusions:

Bubble detectors are versatile tools for both neutron dosimetry and space radiation monitoring.
The critical rate of energy loss is fundamental to bubble detector performance in track registration.
Further research suggests potential for identifying specific high-energy heavy ions.

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