Observation of second metastable state in superheated emulsion detector

Sarkar, Rupa; Mondal, Prasanna Kumar; Chatterjee, B.

doi:10.1016/j.nima.2008.05.023

Cited by 7 publications

(13 citation statements)

References 31 publications

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“…The superheated droplets, when exposed to energetic radiations, nucleate independent of each other with the production of an acoustic pulse [14] and the decay of these droplets is expected to be exponential in nature. However, when a SED is periodically exposed to neutrons [15] (or gamma ray photons) with periods of radiation-off regions in between, it is observed that the decay is not quite monotonic as expected. An example of such a nucleation rate data is shown in Fig.…”

Section: Introductionmentioning

confidence: 66%

“…Nucleation of a droplet can be detected either by detecting the pressure pulse [14,18,19] produced due to the rapid growth of the microbubble or by detecting the volume change [20] caused due to the liquid-to-vapor phase transition. The observed nucleation rate data, as reported earlier [15], cannot be explained by a simple single-state model, and a multi-state model is required. Here, for simplicity a two-state model is used to give a proper explanation to the observed nucleation rate data.…”

Section: Theorymentioning

confidence: 71%

“…The data shows unusual sharp curvature at the beginning of each irradiations and the nucleation rate at the beginning of second and third radiation exposures is much higher than that at the end of the previous irradiations. The discrepancy in nucleation rate also increases with the increase in the durations when the radiation was off [15]. The decay is not quite exponential either and shows a steep initial drop when the radiation is turned on.…”

Section: Introductionmentioning

confidence: 95%

“…One may note that the volume distribution (x j +y j )/ P j (x j +y j ) at any later time differs from f(v j ) and continues to vary with time and the distribution actually gets more and more monodisperse with time with the average droplet volume becoming smaller. During irradiation both x j and y j diminishes, though, y j diminishes very fast compared to x j [15]. In presence of decay the equilibration time is [4cd+(a j +dÀb j Àc) 2 ] À1/2 .…”

Section: Article In Pressmentioning

confidence: 99%

“…The decay is not quite exponential either and shows a steep initial drop when the radiation is turned on. These could only be explained if the SED is considered to be comprised of multiple groups or states of nucleating droplets [15]. A simple two-state model of decaying superheated droplets is presented in this article.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Two-state modeling of the superheated emulsion detector

Mondal

Chatterjee

2009

Nuclear Instruments and Methods in Physics Research Section A:

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Section: Introductionmentioning

confidence: 66%

Section: Theorymentioning

confidence: 71%

Section: Introductionmentioning

confidence: 95%

Section: Article In Pressmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Two-state modeling of the superheated emulsion detector

Mondal

Chatterjee

2009

Nuclear Instruments and Methods in Physics Research Section A:

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Study of gamma ray response of R404A superheated droplet detector using a two-state model

Mondal¹,

Chatterjee²

2013

Applied Radiation and Isotopes

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The superheated droplet detector (SDD) is known to be gamma ray insensitive below a threshold temperature which made them excellent candidates for neutron detection in the presence of gamma rays. Above the threshold temperature, the gamma ray detection efficiency increases with increase in temperature. In this work the gamma ray threshold temperature has been studied for SDD using R404A as the active liquid and is compared to the theoretical prediction. The temperature variation of gamma ray detection efficiency and interstate transition kinetics has also been studied using a two-state model. The experiments are performed at the ambient pressure of 1 atm and in the temperature range of 17-32 °C using a 662 keV (1)(37)Cs gamma ray source.

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Characterization of R-134a superheated droplet detector for neutron detection

Mondal

Sarkar

Chatterjee

2014

Applied Radiation and Isotopes

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R-134a (C2H2F4) is a low cost, easily available and chlorine free refrigerant, which in its superheated state can be used as an efficient neutron detector. Due to its high solubility in water the R-134a based superheated droplet detectors (SDD) are usually very unstable unless the detector is fabricated using a suitable additive, which stabilizes the detector. The SDD is known to have superheated droplets distributed in a short-lived and in a relatively long-lived metastable states. We have studied the detector response to neutrons using a (241)AmBe neutron source and obtained the temperature variation of the nucleation parameters and the interstate kinetics of these droplets using a two-state model.

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Observation of second metastable state in superheated emulsion detector

Cited by 7 publications

References 31 publications

Two-state modeling of the superheated emulsion detector

Two-state modeling of the superheated emulsion detector

Study of gamma ray response of R404A superheated droplet detector using a two-state model

Characterization of R-134a superheated droplet detector for neutron detection

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