To investigate the effects of 147 MHz radiofrequency irradiation at various AM modulation on the calcium efflux from chicken brain tissue in vitro.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
147 MHz
Modulation type:
AM
|
|
| Frequency | 147 MHz |
|---|---|
| Type | |
| Waveform |
| Modulation type | AM |
|---|---|
| Modulation frequency | 0–35 Hz |
| Modulation depth | 90 % |
| Additional info |
Modulation frequencies of 0.5, 3, 6, 9, 11, 16, 20 and 25 Hz and an unmodulated carrier wave were also used. |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| power density | 10 W/m² | unspecified | measured | - | or 20 W/m² |
The 147 MHz VHF filed was AM modulated at 0.5, 3, 6, 9, 11, 16, 20, 25, and 35 Hz. Unmodulated exposure and fields modulated at 0.5 and 3 Hz as well as 35 Hz modulation did not significantly alter the calcium efflux. Whereas a progressive increase of calcium efflux at modulation frequencies from 6 to 16 Hz were observed. At 20 Hz AM modulation the calcium efflux were comparable to the one at 6 Hz. Results obtained at 25 Hz modulation were not statisically significant.
Data obtained from an additional experiment with NaCN poisoned brain tissue did not differ and suggests that the calcium efflux is independent of other metabolic activities.
Finally, a preliminary experiment with chicken skeletal muscle did not indicate any major differences.
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