Density dependence of the spur lifetime and the "escape" hydrated electron yield in the low-LET radiolysis of supercritical water at 400 oC
36th Annual CNS-CNA Student Conference - 2012 June 12


Presented at:
36th Annual CNS-CNA Student Conference
2012 June 12
Location:
Saskatoon, Canada
Session Title:
CNS/CNA Student Conference 2012

Authors:
Sunuchakan Sanguanmith (Université de Sherbrooke )
Jintana Meesungnoen (Université de Sherbrooke )
Jean-Paul Jay-Gerin (Université de Sherbrooke )
  

Abstract

The “spur lifetime” (tau/s) in the low-LET radiolysis of supercritical water (SCW) at 400 °C has been determined as a function of density by using a simple model of energy deposition initially in spurs, followed by the random diffusion of the species formed until spur expansion is complete. The values of tau/s are found to decrease from ~5.0 × 10-6 to ~5.0 × 10-8 s over the density range 0.15 to 0.6 g/cm3. Using Monte-Carlo simulations, our calculated density dependence of the “escape” hydrated electron (e-aq) yield (i.e., at time tau/s) reproduces fairly well Bartels and co-workers’ scavenged e-aq yield data, strongly suggesting that these data may have been measured at time close to tau/s.

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