Further modeling of spur processes in the radiation chemistry of pure water and aqueous solutions. [14 MeV electron pulse and gamma radiation]

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1984

OSTI ID:5616510

Youngblade, W

All of the data from a comprehensive study of the kinetics of hydrated electron decay in the 14 MeV electron pulse radiolysis of pure water and aqueous solutions have been modeled within experimental error. The overlapping spur model utilized employs a constant energy fraction (0.2) of high, constant spur density (representing blobs/short tracks) and another constant energy fraction (0.8) of a low, variable spur density region (representing isolated spurs) whose spur density is proportional to the pulse dose. The model also contains a hydrated electron probability density displaced from the center of the spur. Adjustments made to fit experimental data from different aqueous solution pulse radiolysis studies have been minor and in agreement with independent experimental data. The spur model has been successfully tested against experimental hydrated electron data for 14 MeV electrons over a wide range of pulse doses (0.5-80 Gy), time regimes (10/sup -11/-10/sup -5/ s), and types of scavengers of spur transients (e/sub aq//sup -/, .OH, and H/sup +/). Modeling calculations were extended to include comparisons with pulsed 14 MeV electron and ..gamma.. radiolysis experiments which measured H/sub 2/, H/sub 2/O/sub 2/ and non-molecular product yields in the presence of various OH., H. and e/sub aq/-scavengers. Modeling parameters were unchanged from those used for the hydrated electron decay calculations described above. Non-molecular product yield calculations were in good agreement with experiment.

• Research Organization: Delaware Univ., Newark (USA)
• OSTI ID: 5616510
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
AQUEOUS SOLUTIONS
BEAMS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DATA
DECAY
DECOMPOSITION
DISPERSIONS
ELECTROMAGNETIC RADIATION
ELECTRON BEAMS
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
GAMMA RADIATION
HYDRATION
HYDROGEN COMPOUNDS
INFORMATION
IONIZING RADIATIONS
IRRADIATION
KINETICS
LEPTON BEAMS
LEPTONS
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
MIXTURES
NUMERICAL DATA
OXYGEN COMPOUNDS
PARTICLE BEAMS
PULSED IRRADIATION
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADIOLYSIS
SOLUTIONS
SOLVATED ELECTRONS
SOLVATION
THEORETICAL DATA
WATER