Extension of a spur overlap model for the radiolysis of water to include high linear energy transfer regions. [10-15 MeV electron pulses]

Journal Article · Thu Aug 06 04:00:00 EDT 1981 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j150616a007· OSTI ID:6318323

Short, D R; Trumbore, C N; Olson, J H

Results are presented from computer calculations based upon an improved diffusion-kinetic model of the spur which includes a novel initial distribution for the hydrated electron, an approximate mathematical treatment of the spherically symmetrical overlap of spurs, and a high linear energy transfer (LET) component. The results of such calculations for various conditions of pulse dose and concentrations of scavengers of individual primary chemical species in the spur are compared with experimental data obtained from water and aqueous solutions irradiated with 10-15 MeV electron pulses. Very good agreement between calculated and experimental hydrated electron decay kinetics in pure water was observed earlier at high pulse dose. However, the calculated and experimental curves are observed to deviate for times greater than 10 ns when low pulses doses and low scavenger concentrations are considered. This deviation in experimental and calculated hydrated electron decay cannot be explained by assuming the presence of a hydrated electron scavenging impurity or by employing a random distribution of nearest-neighbor interspur distances to refine the overlap approximation. However, calculations which model a constant percentage of the total energy deposition in high spur density (high-LET) regions are shown to produce good agreement with pure-water data over the entire time range studied for all pulse-dose values considered. These results provide support for theories proposing the formation of a significant number of high-LET regions in water irradizated with electrons generally characterized as being of low LET.

• Research Organization: Univ. of Delaware, Newark
• OSTI ID: 6318323
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 85:16; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
BEAMS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
ELECTRON BEAMS
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY TRANSFER
FERMIONS
HYDRATION
HYDROGEN COMPOUNDS
IRRADIATION
LEPTON BEAMS
LEPTONS
LET
MEV RANGE
MEV RANGE 10-100
OXYGEN COMPOUNDS
PARTICLE BEAMS
PULSED IRRADIATION
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIOLYSIS
SCAVENGING
SOLVATED ELECTRONS
SOLVATION
WATER