The study was performed on blood samples of physiotherapists to investigate a possible effect of long-term high frequency exposure (emitted by therapeutic diathermy devices used for medical treatment) on immune parameters, in particular leucocyte subpopulations and the reactivity of T cells.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
27.12 MHz
Exposure duration:
10 min
short wave diathermy device
|
|
|
Exposure 2:
433.92 MHz
Exposure duration:
10 min
Decimeter diathermy device
|
- |
|
Exposure 3:
2.45 GHz
Modulation type:
CW
Exposure duration:
10 min
|
- |
Limits according to Austrian Standards for EF and MF are 67.9 V/m and 0.18 A/m for shortwave (27.12 MHz), 73.7 V/m and 0.19 A/m for decimeter (433.92 MHz) and 137 V/m and 0.36 A/m for microwave (2.45 GHz) diathermy devices, respectively.
| Frequency | 27.12 MHz |
|---|---|
| Type | |
| Exposure duration | 10 min |
| Additional info | short wave diathermy device |
| Exposure source |
|
|---|---|
| Distance between exposed object and exposure source | 0 m |
| Setup | The positions where therapists usually stand during the treatment of patients were selected for evaluation. |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| electric field strength | 61.4 V/m | minimum | measured | - | 40 cm above the floor |
| electric field strength | 868.3 V/m | maximum | measured | - | 40 cm above the floor |
| electric field strength | 67.3 V/m | minimum | measured | - | 85 cm above the floor |
| electric field strength | 1,000 V/m | maximum | measured | - | 85 cm above the floor |
| electric field strength | 30.7 V/m | minimum | measured | - | 95 cm above the floor |
| electric field strength | 1,000 V/m | maximum | measured | - | 95 cm above the floor |
| electric field strength | 13.7 V/m | minimum | measured | - | 135 cm above the floor |
| electric field strength | 180 V/m | maximum | measured | - | 135 cm above the floor |
| electric field strength | 6 V/m | minimum | measured | - | 175 cm above the floor |
| electric field strength | 42 V/m | maximum | measured | - | 175 cm above the floor |
| magnetic field strength | 0.42 A/m | minimum | measured | - | 40 cm above the floor |
| magnetic field strength | 1 A/m | maximum | measured | - | 40 cm above the floor |
| magnetic field strength | 0.8 A/m | minimum | measured | - | 85 cm above the floor |
| magnetic field strength | 1.21 A/m | maximum | measured | - | 85 cm above the floor |
| magnetic field strength | 0.6 A/m | minimum | measured | - | 95 cm above the floor |
| magnetic field strength | 1.09 A/m | maximum | measured | - | 95 cm above the floor |
| magnetic field strength | 0.15 A/m | minimum | measured | - | 135 cm above the floor |
| magnetic field strength | 0.18 A/m | maximum | measured | - | 135 cm above the floor |
| magnetic field strength | 0.09 A/m | - | measured | - | 175 cm above the floor |
| Frequency | 433.92 MHz |
|---|---|
| Type | |
| Exposure duration | 10 min |
| Additional info | Decimeter diathermy device |
No parameters are specified for this exposure.
There were no statistically significant differences between the control and exposed persons. In both groups all immune parameters were within normal ranges.
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