24 rats were divided into eight groups (according to the power flux densities; each group n=3) and skin temperature of the shaved back was measured before, during and after exposure under anaesthesia. Additionally, 48 rats with implanted electrodes were divided into eight groups (each group n=6) and exposed in restrained position.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
35 GHz
Modulation type:
pulsed
Exposure duration:
continuous for 30 s
|
|
Rats were divided into eight groups: i) exposure to 0.5 W/cm² over an area of 3.6 cm² ii) exposure to 0.9 W/cm² over an area of 3.6 cm² iii) exposure to 1.2 W/cm² over an area of 3.6 cm² iv) exposure to 1.5 W/cm² over an area of 3.6 cm² v) exposure to 1.5 W/cm² over an area of 1.8 cm² vi) exposure to 3.5 W/cm² over an area of 1.8 cm² vii) exposure to 5.0 W/cm² over an area of 1.8 cm² viii) exposure to 7.5 W/cm² over an area of 1.8 cm²
| Frequency | 35 GHz |
|---|---|
| Type | |
| Exposure duration | continuous for 30 s |
| Exposure source | |
|---|---|
| Chamber | screened exposure chamber with the antenna inside the chamber |
| Setup | exposure beam directed to the rat's back; for EEG recording rat fixed by rubberized fabrics on a plastic board on the object stage of the exposure chamber; for temperature measurments rats anaesthetized |
| Sham exposure | A sham exposure was conducted. |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| power | 40 kW | peak value | - | - | - |
| power density | 0.5 W/cm² | - | - | - | for an exposure area of 3.6 cm² |
| power density | 1.2 W/cm² | - | - | - | for an exposure area of 3.6 cm² |
| power density | 0.9 W/cm² | - | - | - | for an exposure area of 3.6 cm² |
| power density | 1.5 W/cm² | - | - | - | for an exposure area of 3.6 cm² |
| power density | 1.5 W/cm² | - | - | - | for an exposure area of 1.8 cm² |
| power density | 3.5 W/cm² | - | - | - | for an exposure area of 1.8 cm² |
| power density | 5 W/cm² | - | - | - | for an exposure area of 1.8 cm² |
| power density | 7.5 W/cm² | - | - | - | for an exposure area of 1.8 cm² |
The data showed that stress reactions (indicated by EEG analysis) are more intense during the first part of the irradiation than during the later part: stress reactions began at the first second and the intensities of stress reactions were much higher during the 1st-17th s than during the 17th-30th s. The skin temperature increase (thermal pain) produced by millimeter wave exposure was the principle reason for stress reactions. As expected, at the higher levels of irradiation, the stress reaction time decreased and the stress reaction intensity increased.
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