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A device for the complete elimination of static electricity in paraffin sectioning.

In paraffin sectioning static electricity is often induced by friction between the knife and the block. The section can be discharged by ionizing the air in the vicinity of the paraffin. This can be achieved by mounting a strip containing radioactive polonium near the microtome knife. This approach implies a certain radiological risk. An alternative solution is to apply a high electric field close to the knife. The latter method may offer hazards related to the high tension and production of ozone. In comparing the risks and benefits of the two methods we have concluded that the application of a high electric field offers less risks to people in the working area than the installation of a radioactive source. The costs of the two methods are of the same order.