Low-level magnetic and electric fields

LOW-LEVEL MAGNETIC FIELD

In powerline studies magnetic field value 0.3 uT (microTesla) is often associated with childhood leukemia [1,2]. In our measurements we utilise this as a reference value.

High magnetic field values have been associated in some studies with Alzheimer risk [1,2,3] and with depression risk [1,2,3]. A highly variating, pulsed magnetic field is seen riskier than a steady magnetic field  [1].

In addition to magnetic field strength, the frequency of the magnetic field is important. When the frequency is over 2 kHz (over 2000 Hz), we consider this as a riskier situation and apply 10 times stricter reference value. Good to know: Several home appliances produced high, pulsing magnetic fields. Some of these devices can be found in bedrooms, like electronic clock radios. .  

The risk of magnetic fields can be minimised by keeping enough distance to the source. Similarly, miniming exposure time is also important. It is very expensive (and difficult) to reduce magnetic fields by isolating them with the mu-metal.

In our magnetic fields measurements we utilise the Gigahertz Solutions NFA-1000 -device, which is capable of 3-dimensional magnetic field modelling.

 LOW-LEVEL ELECTRIC FIELDS

TCO is a product certification system for monitors and other electronic equipment. TCO recommends 10 V/m for displays, when measured at 50 cm distance. High electric field values are linked to poor air quality [1,2] and various respiratory/occupational ilnesses [1,2,3].

10 V/m is a reference value for our electric field measurements in homes. At the workplace electric fields values are often several magnitudes higher. Therefore, in occupational exposure we aim to identify risk spots. Electric fields can be reduced with proper grounding, wise cabling installations and by isolating.

In our electric field measurements we utilise the Gigahertz Solutions NFA-1000 -meter with a TCO-compliant probe.