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Radiation Protection Dosimetry Advance Access originally published online on May 12, 2008
Radiation Protection Dosimetry 2008 130(3):285-290; doi:10.1093/rpd/ncn058
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© The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

The performance evaluation of gamma- and neutron-sensitive superheated emulsion (bubble) detectors

S. G. Vaijapurkar*, Kana Ram Senwar, J. S. Hooda and A. Parihar

Defence Laboratory, Jodhpur, India

* Corresponding author: vaijapurkar{at}yahoo.com

Received August 21, 2007, amended January 16, 2008, accepted January 20, 2008

The superheated emulsion (bubble) detectors have been developed at Defence Laboratory, Jodhpur (DLJ), India, for measurement of gamma doses. The developed detectors have been tested at Radiation Safety and System Division (RSSD), Bhabha Atomic Research Center (BARC), Mumbai (India) and DLJ having ISO-17025 accredited facility for testing and calibration of Radiation Monitors. A series of experiments were conducted to determine the gamma and neutron sensitivity of these detectors, i.e. batch homogeneity, reproducibility, dose equivalent rate effect, gamma/neutron dose equivalent response, gamma/neutron energy response and change in gamma sensitivity as a function of temperature. All the results were within ± 20% of themselves. It is observed that the response of the detector is dependent upon temperature. The recommended ideal working temperature range of the detector is 20–28°C, but a temperature correction is required beyond ~30ºC. The temperature compensation may be possible up to 45°C in improved version using specially prepared reversible thermo-sensitive polymer gel. The detector may have applications in radio-diagnosis, R&D laboratories, and health physics as well as an indicator of gamma radiation for dirty bomb to be useful for first responder in any radiological emergency.


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