To study the presence and absence of heart rate and blood pressure changes during two separate series of exposure of rats to high-peak-power microwave pulses: 1) initial pilot studies of 1.7-1.8 GHz exposures; and 2) further studies of 1.2-1.4 GHz at higher peak power densities.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
1.7–1.8 GHz
Modulation type:
pulsed
Exposure duration:
continuous for 10 s
|
|
|
Exposure 2:
1.2–1.4 GHz
Modulation type:
pulsed
Exposure duration:
continuous for 10 s
|
|
Pulse durations and peak power densities were not constant during any exposure period. Details of the propagated field, typical waveforms, and dosimetry have been published previously [Platt et al., 1989].
| Frequency | 1.7–1.8 GHz |
|---|---|
| Type | |
| Exposure duration | continuous for 10 s |
| Modulation type | pulsed |
|---|---|
| Repetition frequency | 1 Hz |
| Additional info |
pulse width of 40-85 ns |
| Exposure source |
|
|---|---|
| Distance between exposed object and exposure source | 3 m |
| Setup | Animals were individually placed in a vented restraint cage, which allowed some movement but maintained the long axis of the body in a fixed position relative to the field. The cage was positioned 10° left of the antenna boresight at a distance of 3 m. |
| Sham exposure | A sham exposure was conducted. |
| Additional info | The animal was exposed to 10 MW pulses. During the exposure, a sharp sound was emitted with each pulse. For this reason, the same animal was exposed after 10-15 min to another 10 pulses, using a 2-in thick Styrofoam shield to cover the horn antenna and achieve sound attenuation. In addition, a sham exposure was performed using the Styrofoam shield and an aluminium-foil shield to eliminate MW transmission. The sequence of shielded and non-shielded exposures to each animal was randomized. |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| power density | 4.5 kW/cm² | peak value | measured | - | 3.3-6.5 kW/cm² |
| Frequency | 1.2–1.4 GHz |
|---|---|
| Type | |
| Exposure duration | continuous for 10 s |
| Modulation type | pulsed |
|---|---|
| Repetition frequency | 1 Hz |
| Additional info |
pulse width of 40-70 ns |
| Exposure source |
|
|---|---|
| Distance between exposed object and exposure source | 3 m |
| Sham exposure | A sham exposure was conducted. |
| Additional info | The sound was attenuated by adding Eccosorb sound-absorbing material around the perimeter of the antenna. Effects of shielding with aluminium foil alone were tested. |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| power density | 32.6 kW/cm² | peak value | measured | - | 14.6-51.6 kW/cm² |
The results do not suggest any serious detrimental cardiovascular effects resulting from acute exposure of rats to high-peak-power microwave pulses.
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