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Limited Removal of Po²¹⁰ and Pb²¹⁰ from Soil and Fertilizer by Leaching

Radioelements Po²¹⁰ and Pb²¹⁰ are known to be present in plants. They enter the plants primarily by root absorption. Heavy and continued fertilization increases the level of radio-elements in soil and thus in crops so produced. Results obtained from laboratory experiments show that there is limited removal of Po²¹⁰ and Pb²¹⁰ by leaching from soil or from fertilizer. Mechanical agitation appeared to increase the leaching rate of these elements. Generally, Po²¹⁰ was leached from soil or from soil-fertilizer mixture much easier than Pb²¹⁰, with or without agitation.

Key Words: Ra ²²⁰ • Tobacco • Radioactivity • Irrigation • Agitation

Received for publication March 9, 1970.