To compare the acute effects of continuous wave and pulsed 9.3 GHz radiofrequency irradiation upon the thermoregulatory responses and related physiological processes in anesthetized rats.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
9.3 GHz
Modulation type:
pulsed
Exposure duration:
intermittent*
|
|
|
Exposure 2:
9.3 GHz
Modulation type:
CW
Exposure duration:
intermittent*
|
|
*The exposure was discontinued when the colonic temperature increased to 39.5?C and it was initiated again when the temperature returned to 38.5?C. This procedure was continued for 8 cycles.
| Frequency | 9.3 GHz |
|---|---|
| Charakteristic | |
| Polarization | |
| Exposure duration | intermittent* |
| Additional info | Animals wre exposed in H-orientation (long axis parallel to magnetic field) |
| Modulation type | pulsed |
|---|---|
| Pulse width | 2 µs |
| Repetition frequency | 500 Hz |
| Exposure source | |
|---|---|
| Distance between exposed object and exposure source | 1.5 m |
| Chamber | Eccosorb RF-shielded anechoic chamber maintained at 24?C and 50% humidity |
| Setup | Rats placed on a holder. |
| Additional info | The holder consisted of seven 0.5 cm (O.D) Plexiglas rods mounted in a semicircular pattern on 4 cm x 6 cm Plexiglas plates (0.5 cm thick). |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| power density | 600 W/m² | mean | measured | - | 18.6 W/kg corresponding average whole body SAR |
| power density | 300 W/m² | mean | measured | - | 9.3 W/kg corresponding average whole body SAR |
| Frequency | 9.3 GHz |
|---|---|
| Charakteristic | |
| Polarization | |
| Exposure duration | intermittent* |
| Additional info | Animals were exposed in H.orienation (long axis parallel to magnetic field) |
| Modulation type | CW |
|---|
| Exposure source |
|
|---|---|
| Distance between exposed object and exposure source | 1.5 m |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| power density | 300 W/m² | mean | measured | - | 9.3 W/kg corresponding average whole body SAR |
| power density | 600 W/m² | mean | measured | - | 18.6 W/kg corresponding average whole body SAR |
There were no significant differences between the effects of continuous wave and pulsed wave exposure. At both power densities, the subcutaneous and tympanic temperature increases significantly exceeded the colonic temperature increase. At both irradiation levels, heart rate increased significantly and returned to baseline when exposure was discontinued. Blood pressure and respiratory rate did not significantly change during exposure.
The levels of subcutaneous heating and heart rate change were greater, and the times required to achieve and to recover from a 1°C colonic temperature increase were longer than in previous investigations conducted at 2.8 GHz (e.g. publication 9288). Data of these studies suggest that the carrier frequency used during irradiation markedly affects the pattern of heat distribution and the physiological responses of radiofrequency-irradiated rats.
This website uses cookies to provide you the best browsing experience. By continuing to use this website you accept our use of cookies.
