Track effects in water radiolysis: Yields of the Fricke dosimeter for carbon ions with energies up to 1700 MeV

Journal Article · Thu Apr 14 04:00:00 EDT 1994 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100066a023· OSTI ID:7069541

LaVerne, J A; Schuler, R H ^[1]

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1. Univ. of Notre Dame, IN (United States)

The radiation chemical yields of the Fricke dosimeter have been determined for carbon ions with energies up to 1700 MeV. These yields can be described by a general relation of the form G[sub 0] = G[sub B] + (G[sub [infinity]]-G[sub B]) (1 - E[sub B]/E[sub 0])F where G[sub [infinity]] and G[sub B] represent the limiting yields at high energy and at the Bragg peak, respectively, and F is a dimensionless factor given by a(E[sub 0] - E[sub B])[sup m]/(1 + a(E[sub 0] - E[sub B])[sup m]). The initial value of the carbon ion energy is E[sub 0] in MeV while E[sub B] is the energy at the Bragg peak, 3 MeV in the case of carbon ions. Taking G[sub [infinity]] as the yield observed with fast electrons (15.5 molecules/100 eV) and G[sub B] as 2.65 molecules/100 eV, the yields observed for aerated solutions are fitted very well for carbon ions by values of the empirical parameters a = 0.0258 and m = 0.520. It is shown that the differential yields are never more than 25% greater than the yields averaged over the track. Comparative measurements made in deaerated solutions provide information on the energy dependence of the hydrogen atom yield which increases from small values at low energies to only [approximately] 2 H atoms/100 eV for 1000-MeV carbon ions. 19 refs., 10 figs., 1 tab.

• OSTI ID: 7069541
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 98:15; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400500 -- Photochemistry
440102 -- Radiation Instrumentation-- Radiation Dosemeters
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
AERATION
BRAGG CURVE
CARBON IONS
CHARGED PARTICLES
CHEMICAL DOSEMETERS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
DECOMPOSITION
DIAGRAMS
DISPERSIONS
DOSEMETERS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
HYDROGEN
HYDROGEN COMPOUNDS
IONS
LEPTONS
MEASURING INSTRUMENTS
MIXTURES
NONMETALS
OXYGEN COMPOUNDS
RADIATION EFFECTS
RADIOLYSIS
SOLUTIONS
WATER
YIELDS