To measure sodium-dependent high-affinity choline uptake in the brain of rats after acute exposure to pulsed or continuous wave (CW) 2450 MHz microwaves. In addition the effects of microwave exposure in two exposure systems (the cylindrical waveguide and the miniature anechoic chamber) are compared.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
2,450 MHz
Exposure duration:
continuous for 45 min
|
|
|
Exposure 2:
2,450 MHz
Exposure duration:
continuous for 45 min
|
|
Rats were exposed to pulsed or CW microwaves in either a cylindrical waveguide system or a miniature anechoic chamber.
| Frequency | 2,450 MHz |
|---|---|
| Type | |
| Charakteristic |
|
| Polarization |
|
| Exposure duration | continuous for 45 min |
| Exposure source |
|
|---|---|
| Chamber | The cylindrical waveguide system [Guy et al., 1979] consisted of four individual exposure tubes consisting of a section of circular waveguide made of galvanized wire screen. The circularly polarised field in TE11 mode propagated perpendicular to the longitudinal axis of the rat housed in a plastic chamber with a floor of glass rods. |
| Sham exposure | A sham exposure was conducted. |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| SAR | 0.6 W/kg | average over mass | - | whole body | - |
| power density | 1 mW/cm² | - | - | - | - |
| Frequency | 2,450 MHz |
|---|---|
| Type | |
| Polarization | |
| Exposure duration | continuous for 45 min |
| Exposure source | |
|---|---|
| Chamber | The miniature anechoic chamber [Guy, 1979] was made of thick stock hardboard panels lined inside with RF absorbing materials. A standard-gain horn antenna mounted at the tapered roof of the chamber provided plane-polarised irradiation. A plastic animal cage was placed on a Styrofoam platform such that its long axis was parallel to the electric field. |
| Sham exposure | A sham exposure was conducted. |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| SAR | 0.6 W/kg | average over mass | - | whole body | - |
| power density | 2.07 mW/cm² | - | - | - | - |
1) The effects on frontal cortical choline uptake are independent of the irradiation system or use of pulsed or continuous wave (CW) microwaves. Decrease in choline uptake was observed in the frontal cortex after microwave irradiation in all of the above exposure conditions. 2) The hippocampal choline uptake decreased after pulsed but not after continuous wave (CW) microwave exposure. 3) The effects on striatal choline uptake depend on the exposure system used. Choline uptake was decreased after irradiation to either pulsed or continuous wave (CW) microwaves in the miniature anechoic chamber. 4) The irradiation to microwaves under the present conditions had no effect on hypothalamic choline uptake.
The results suggest that the biological effects of microwaves can depend on the parameter of the irradiation.
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