| ||Title Page|
| ||Table of Contents|
| ||List of Tables|
| ||List of Figures|
| ||Characterstics of foliar absorption...|
| ||Plant nutrition|
| ||Discussion of results|
| ||Biographical sketch|
| Material Information
||Uptake and translocation of 85 Sr, 59 Fe, 185 W and 134 Cs by banana plants and coconut plants following foliar application.
|| xi, 141 leaves. illus. 28 cm.
|| Thomasson, Walter Neill 1940- ( Dissertant )
Bolch, Emmet William ( Thesis advisor )
Bevis, Herbert A. ( Reviewer )
Roessler, Charles E. ( Reviewer )
Dunovant, Billy G. ( Reviewer )
Uhrig, Robert E. ( Degree grantor )
||University of Florida
||Place of Publication:
||Subjects / Keywords:
||Environmental Engineering Sciences thesis Ph. D. ( local )
Dissertations, Academic -- UF -- Environmental Engineering Sciences ( local )
Plants -- Effect of radiation on ( lcsh )
||Bananas or plantains (cooking bananas) and coconuts comprise a significant part of the diets of the people residing in the areas of Panama and Colombia under consideration for a sea-level interoceanic canal. The coconut is also a major export commodity. Because of their importance in the area diet and economy, a mixed radiotracer experiment on a banana plant and a coconut plant was designed as a part of the evaluation of the radiological effects of a Plowshare project, such as the one proposed for construction of a sea-level interoceanic canal. In conjunction with the experiment, field and laboratory procedures were also developed. A second replicated field study was conducted to measure the rate of accumulation of 134 Cs in bananas following application of the isotope. Carrier-free, soluble tracers (85 Sr, 59 Fe, 185W, and 134 Cs) were applied to a portion of the foliage of both banana and coconut plants. Following foliar absorption, the translocation and distribution of these tracers within the plants were studied – with special emphasis on the fruit. It was found that only 134 Cs accumulated in the banana pulp and the coconut fruit (meat and water) following this type of foliar application. However, some of each radiotracer was detected in plant parts other than the treated foliage. The methodology employed to prevent contamination of the environment and to apply the tracers was very successful. The methodology included covering the ground with plastic sheeting, which in turn was covered with peat moss, and using a plastic bottle with a sponge applicator to treat the foliage. However, detectable levels of radioactivity were found in the banana plants, coconut plants, and weeds and grasses adjacent to the treated plants. Cesium-134 was translocated to adjacent plants in general, while 85 Sr, 59 Fe, and 185W were detected in the fruit of adjacent banana plants and second growth grasses and weeds near the base of the palm tree. The translocation resulted in slight accumulation of 59 Fe and 185W in the peels of the neighboring bananas in particular. This contamination was attributed to direct root-to-root translocation. Cesium-134 accumulation by bananas following foliar absorption was characterized by a first order kinetics function of the type C=Ce(1-e-kt). The rate constant (k) was determined to be -0.133 per day based on the least squares best fit of the data. The replicated experiment provided individual rate constant of -0.123, -0.158, and -0.122 per day for the three test plants. The equilibrium concentration values (Ce) expressed as a percentage of the concentration applied to the foliage were 0.04 percent, 0.80 percent, and 0.12 percent. The Ce varied as a function of the maturity of the fruit and the atmospheric conditions during and following tracer application. However, the rate constants were independent of the atmospheric conditions. As a result of these field experiments, it is evident that even with heavy rain during and following the period of fallout deposition radiologically significant amounts of radioactivitiy will be absorbed and retained by the foliage of banana and coconut plants. Using the results of this study, a model was developed to predict the yearly whole body dose to an individual who eats contaminated bananas. This model evaluates the dose as a function of 10 the concentration (μCi/m2) of fallout on the plant foliage; 2) the rate of consumption of contaminated bananas; and 3) the duration of consumption of the bananas.
||Thesis -- University of Florida.
||Bibliography: leaves 132-140.
| Record Information
||University of Florida
||University of Florida
||All rights reserved by the source institution and holding location.
||alephbibnum - 000580537
oclc - 14050575
|Table of Contents
Table of Contents
List of Tables
List of Figures
Characterstics of foliar absorption and translocation
Discussion of results