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Exposure details |   |
Influence on the mechanisms of generation of distortion product otoacoustic emissions of mobile phone exposure. by Parazzini M, Bell S, Thuroczy G, Molnar F, Tognola G, Lutman ME, Ravazzani P
published in: Hear Res 2005; 208 (1-2): 68 - 78 | | General information: |
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| There were two sessions on separate days (at least 24 h apart) with a genuine (test) exposure and with a sham (control) exposure in a double-blind counterbalanced design. Half of the participants received GSM exposure at 900 MHz and the other half received GSM exposure at 1800 MHz. | |
Exposure 1: |
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| | Exposure setup |
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| exposure source/structure: | cellular phone, at full power | | exposure time pattern: | continuous for 10 min
| | setup details: | A system of phone fixation, made of non-metallic plastic materials and consisting of a headband, an adjustable arm and a phone holder that allowed free head movement, was used for placing the phone in the normal use position, in accordance with CENELEC standard EN 50361.
| | sham: | sham exposure was performed | | add. information: | The sham or genuine exposure was realised using a 50-Ω resistive load or an open-circuit dummy load of the same shape and structure connected to the remote antenna connector of the phone.
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| | Exposure parameters | | parameter: | value: | type: | method: | remark: |
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| power | 2 W | - | - | - | | SAR | 0.41 W/kg | max value | measured | - |
additional information: The indicated maximum SAR was measured at a distance of 30 mm from the surface of the phantom. In normal phone use, this position corresponds approximately to that of the cochlea. | |
measurement and calculation details: In order to estimate the level of EMF exposure in the inner ear region, SAR measurements were made in standard brain tissue equivalent liquid in a phantom using a 3-D step motor robot system, internal E-field probe and a non-metallic phone-positioning system with the phone being held on the phantom in the ''touch position'', according to CENELEC standard EN 50361. The output of the phone had previously been measured using a frequency and power meter and circulators through the external antenna output of the phone. |
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Exposure 2: |
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| | Exposure setup |
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| exposure source/structure: | same setup as in Exposure 1 | | exposure time pattern: | continuous for 10 min
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| | Exposure parameters | | parameter: | value: | type: | method: | remark: |
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| power | 1 W | - | - | - | | SAR | 0.19 W/kg | max value | measured | - |
additional information: same as E1 |
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Return to general data Glossary: antenna, brain, cellular phone, cochlea, double-blind, EMF, exposure, frequency, GSM, inner ear, MHz, motor, phantom, power, probe, pulsed, PW, SAR, Sessions, sham exposure, tissue |
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