Département de Médecine Nucléaire et Radiobiologie, Faculté de Médecine et des Sciences de la Santé, Université de Sherbrooke, 3001, 12ème Avenue Nord, Sherbrooke, Québec J1H 5N4, Canada.
Phys Chem Chem Phys. 2012 Aug 28;14(32):11277-80. doi: 10.1039/c2cp41399j. Epub 2012 Jul 17.
The "spur lifetime" (τ(s)) in the low-linear energy transfer (LET) radiolysis of supercritical water (SCW) at 400 °C has been determined as a function of water density by using a simple model of energy deposition initially in spurs, followed by the random diffusion (Brownian motion) of the species formed until spur expansion is complete. The values of τ(s) are found to decrease from ∼5.0 × 10(-6) to 5.0 × 10(-8) s over the density range from 0.15 to 0.6 g cm(-3). Using Monte-Carlo simulations, our calculated density dependence of the "escape" hydrated electron (e(aq)(-)) yield (i.e., at time τ(s)) reproduces fairly well Bartels and co-workers' scavenged e(aq)(-) yield data, suggesting that these data may have been measured at times close to τ(s).
在 400°C 的超临界水中(SCW)的低线性能量转移(LET)辐射分解中,通过使用最初在刺突中沉积能量的简单模型,以及形成的物质的随机扩散(布朗运动),直到刺突完全扩展,确定了刺突寿命(τ(s))作为水密度的函数。发现 τ(s)的值在密度范围从 0.15 到 0.6 g cm(-3)时从约 5.0×10(-6)到 5.0×10(-8)s 减小。使用蒙特卡罗模拟,我们计算出的“逃逸”水合电子(e(aq)(-))产率(即在时间τ(s)时)的密度依赖性很好地再现了 Bartels 及其同事的清除 e(aq)(-)产率数据,这表明这些数据可能是在接近 τ(s)的时间测量的。