To test if there exist sensitive individuals who perceive subjective symptoms when exposed to radiofrequency fields from cellular phones.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
900 MHz
Modulation type:
CW
Exposure duration:
repeated exposure for less than 30 min, see add. information
|
|
|
Exposure 2:
900 MHz
Modulation type:
pulsed
Exposure duration:
repeated exposure for less than 30 min, see add. information
|
|
|
Exposure 3:
1.8 GHz
Modulation type:
pulsed
Exposure duration:
repeated exposure for less than 30 min, see add. information
|
Double-blind provocation experiments
| Frequency | 900 MHz |
|---|---|
| Type | |
| Exposure duration | repeated exposure for less than 30 min, see add. information |
| Exposure source |
|
|---|---|
| Chamber | The test locations were far away from other dwellings, power lines, and base stations. Test sites were two old wooden houses where no electricity for lighting or heating was used during the tests. |
| Setup | The test subject was sitting in a chair when exposed or sham exposed to a cellular phone positioned on the right side of the head at a distance of 1-5 cm from the ear. In addition to the transmitting phone, an identical ''dummy'' phone was positioned on the other side of the subject's head. The phones were hidden inside fabric bags which were strapped on wooden stands. Microphones were removed from the phones, so that no sound was heard when a phone was emitting RF fields. A portable laptop computer was used to operate the phones. |
| Additional info | Three or four test sessions were performed in random order for each subject during one day, with a break between the tests of at least 60 min. One of the tests was a sham exposure (dummy load), which was always performed as the first or the second session. In the actual exposure situation, the phone was activated after a few minutes and each test lasted for a maximum of 30 min. |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| power | 1 W | - | - | - | - |
| Frequency | 900 MHz |
|---|---|
| Type | |
| Exposure duration | repeated exposure for less than 30 min, see add. information |
| Exposure source |
|
|---|
| Frequency | 1.8 GHz |
|---|---|
| Type | |
| Exposure duration | repeated exposure for less than 30 min, see add. information |
| Exposure source |
|
|---|
The study did not reveal an association between exposure to mobile phones and elctromagnetic hypersensitivity symptoms.
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