title: Biological studies with continuous-wave radiofrequency (28 MHz) radiation.
abstract: Effects of high-frequency (28 MHz) continuous-wave radiation have been studied in the rat and monkey. No histopathological (rat-125 mW cm-2 for 28 days) or hematological (monkey-25 mW cm-2 for 24 days) changes could be attributed to the radiation. In the monkey (125 mW cm-2 for 11 days) there was an increase in urinary calcium concentration which was most likely due to restricted movement. In the rat (220 mW cm-2 for 13 days) there was reduced uptake of iodine by the thyroid, lower levels of plasma thyroid-stimulating hormone, and reduced ratio of protein bound to nonprotein bound iodine. Food consumption was also decreased. The changes are likely to have arisen as a compensatory response to an induced heat load. A nonthermal effect of continuous-wave high-frequency radiation has not been shown in this study. The effects were likely to be associated with either physiological compensation for induced heating or restriction of movement.
mesh_terms: D000818:Animals; D004435:Eating / Q000528:radiation effects; D004573:Electrolytes / Q000652:urine; D006403:Hematologic Tests; D008252:Macaca fascicularis; D008253:Macaca mulatta; D008297:Male; D011846:Radio Waves / Q000009:adverse effects*; D051381:Rats; D011919:Rats, Inbred Strains; D013960:Thyroid Function Tests; D013961:Thyroid Gland / Q000528:radiation effects
chemical_list: D004573:Electrolytes