An overview of the oxidation of ferrous ions in the Fricke dosimeter by heavy ions

Conference · Thu Jan 01 04:00:00 EST 1987

OSTI ID:6064657

LaVerne, J A; Schuler, R H

The Fricke dosimeter, a widely used chemical dosimeter, is well understood in terms of the oxidation of ferrous ion in 0.8 N sulfuric acid solution by H atoms (via production of HO/sub 2/), OH radicals and H/sub 2/O/sub 2/ (Allen, 1961). The production of ferric ion is most sensitive to radical yields, especially H atoms, and is considerably less for heavy ions than for fast electrons. This difference is due to the increased importance of intratrack processes which enhance radical-radical recombination reactions producing molecular products as the linear energy transfer (LET = -dE/dx, i.e., stopping power) increases. The literature contains extensive data on radiolysis of the Fricke dosimeter with heavy ions, however, most of these studies were done with protons or alpha particles where the LET is relatively low (LaVerne and Schuler, 1987). These data are summarized here and combined with our own studies using /sup 4/He, /sup 7/Li, /sup 9/Be, /sup 11/B, and /sup 12/C ions with energies up to 35 MeV. Differential yields are determined for these particles at specific energies and their dependence on track structure is discussed.

• Research Organization: Notre Dame Univ., IN (USA). Radiation Lab.
• DOE Contract Number: AC02-76ER00038
• OSTI ID: 6064657
• Report Number(s): DOE/ER/00038-3004; CONF-870701-2; ON: DE87012205
• Country of Publication: United States
• Language: English

Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
DOSEMETERS
HEAVY ION REACTIONS
ION SOURCES
IONS
IRON IONS
MEASURING INSTRUMENTS
NUCLEAR REACTIONS
SPECTROPHOTOMETRY