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Mobile and Cell phone radiation - exposure levels
in
Despite what some mobile phone companies are saying, mobile phones do radiate microwaves
similar to those used in a microwave oven to cook food. Between 20% and 80% of the energy
is absorbed by the user's head. The percentage absorbed depends on the design of the
phone, type of aerial or antenna (the stubby ones which you can not extend are worse for
pushing energy into the user's head), and how far it is to the nearest base-station mast.
Thermal exposure results in a measurable and significant rise in body tissue temperature and is the basis for cooking food in microwave ovens. When maximum levels were set in the 1950s, they were based on field levels the human body could withstand without causing a 1°C rise in body temperature. The possibility of non-thermal effects was discounted. Most national and international bodies (including the UK National Radiological Protection Board) set a rise of 1°C (6 minutes average for local exposure, 15 mins. for whole body) as the maximum permissible long-term temperature rise, although some chose to set the figure lower than this, between 0.2°C
and 1°C.
Non-thermal exposure means that no energy is transferred which could cause a measurable temperature rise. Athermal means that although some heating energy is transferred, the blood etc. will transfer the heat away from the tissue such that the overall temperature rise is limited to below that classified for thermal exposure. Despite considerable evidence in published scientific literature for biological effects of electro-magnetic radiation in the RF/MW range of the spectrum at specific absorption rates (SARs) far too low to produce a heating response, this still continues to be the case. However, the conclusions section of the NRPB "Doll Report", on non-ionising radiation effects, states: "Animal studies conducted at frequencies above about 100kHz have provided some evidence for effects on tumour incidence...". [4]
Thermal exposure results in a measurable and significant rise in body tissue temperature and is the basis for cooking food in microwave ovens. When maximum levels were set in the 1950s, they were based on field levels the human body could withstand without causing a 1°C rise in body temperature. The possibility of non-thermal effects was discounted. Most national and international bodies (including the UK National Radiological Protection Board) set a rise of 1°C (6 minutes average for local exposure, 15 mins. for whole body) as the maximum permissible long-term temperature rise, although some chose to set the figure lower than this, between 0.2°C
and 1°C.
Non-thermal exposure means that no energy is transferred which could cause a measurable temperature rise. Athermal means that although some heating energy is transferred, the blood etc. will transfer the heat away from the tissue such that the overall temperature rise is limited to below that classified for thermal exposure. Despite considerable evidence in published scientific literature for biological effects of electro-magnetic radiation in the RF/MW range of the spectrum at specific absorption rates (SARs) far too low to produce a heating response, this still continues to be the case. However, the conclusions section of the NRPB "Doll Report", on non-ionising radiation effects, states: "Animal studies conducted at frequencies above about 100kHz have provided some evidence for effects on tumour incidence...". [4]