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POURQUOI IL FAUT S'Y INTERESSER

Si on habite à moins de 400 mètres d'une station-relais de téléphonie mobile, on a 3 fois plus de risques d'être atteint d'un cancer

Des médecins allemands – Drs Horts Eger, Klaus Uwe Hagen, Birgit Lukas, Peter Vogel, Hlemut Voit – ont rendu publics, dans un communiqué de presse diffusé le 20 juillet 2004, les résultats d'une étude épidémiologique qu'ils ont menée autour d'une station de base, à Naila (Allemagne)

Leurs objectifs était d'examiner si les riverains d'antennes-relais étaient exposés à un risque accru d'être nouvellement atteint par des tumeurs malignes.
Il a ainsi été établi que la part des cas de malades de cancer nouvellement découverts était sensiblement plus élevée chez les personnes résidant à proximité de la station-relais que chez ceux qui habitent à plus grande distance.

Pour les années 1999-2004, donc après 5 années de fonctionnement de l'émetteur, le risque relatif d'être nouvellement touché par un cancer a été triplé pour les habitants les plus proches.

Les médecins auteurs de cette étude concluent en soulignant que le schéma de leur étude pilote est simple et peut être réutilisé à tout autre endroit.

PRESSE
+ Appel de Fribourg
+ COMMUNIQUE DE PRESSE DU CONSEIL FEDERAL
 -  Comment fonctionne la télécommunication mobile
+ M.Leuenberger
+ PREMIERE VICTOIRE
+ QUE DIT L'OMS

Technique
+ C'EST QUOI L'ELECTROSMOG
+ FREQUENCES
+ NORMES AUTRICHIENNES
+ NORMES SUISSES

POP CORN
UMTS = micro-ondes pulsées = DANGERS

On connaît les effets sur le biologique, officiellement, depuis le 8 octobre 1945. Tout simplement grâce à Percy Spencer qui a eu la bonne idée de mettre des grains de maïs en face de la sortie d'un magnétron d'un radar, ce qui lui a donné du pop corn au final, et il en a profité pour déposer un brevet déjà à l'époque.
Donc les effets sur le biologique, on les connaît depuis longtemps. Sans entrer dans le détail des autres recherches qui sont liées aux militaires, qui n'ont rien à voir avec la téléphonie mobile, mais de toute façon les micro-ondes pulsées en ELF, les scientifiques eux connaissent leurs effets au niveau du système nerveux.
C'est en effet les magnétrons des radars de l'époque qui ont donné naissance au four à micro-ondes. Les premiers radars fonctionnaient sur 2450 MHz, fréquence qui a été abandonnée, tout le monde devine pourquoi.

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brochure: rayonnement et santé

Comment fonctionne la télécommunication mobile?

La télécommunication mobile fonctionne selon le principe du réseau cellulaire. Chaque cellule possède une station de base qui assure la liaison, par ondes hertziennes, avec le téléphone mobile situé à proximité, voire à l'intérieur de sa cellule. Une station de base est constituée d'une unité de commande et de plusieurs antennes émettrice si réceptrices généralement fixées à un pylône. Ces stations sont reliées à une centrale par une ligne téléphonique conventionnelle ou par faisceaux hertziens. C'est de là que partent les conversations que la station transmet au téléphone mobile, et c'est là qu'aboutissent les conversations provenant d'un téléphone mobile. Lorsqu'un portable quitte une cellule, la liaison s'établit automatiquement avec la station adjacente.
La taille de la cellule est déjà fixée lors de la planification du réseau en fonction du nombre d'utilisateurs prévu. Une station de base ne pouvant desservir simultanément que 32 téléphones mobiles, les cellules situées en milieu rural seront grandes (1 à 4 km de diamètre) du fait de la faible concentration de portables, alors que celles qui se trouvent dans les grandes agglomérations seront petites (300 à 400 mètres de diamètre) en raison du nombre important de téléphones cellulaires.

Quels sont les types de rayonnements émis par un téléphone mobile et une station de base?

Tous deux émettent et reçoivent des rayonnements électromagnétiques. Les rayonnements électromagnétiques existent dans notre environnement naturel et technique sous différentes formes : la lumière visible, les ultraviolets, les rayons X et les rayonnements thermiques appartiennent au spectre électromagnétique, tout comme les ondes radio et les micro-ondes, ainsi que les champs électriques et magnétiques des chemins de fer et des installations d'alimentation électriques. Au niveau physique, ces rayonnements diffèrent uniquement par leur fréquence. Les signaux radioélectriques utilisés dans la télécommunication mobile émettent des rayonnements à haute fréquence. Actuellement, on utilise des gammes de fréquences de 900 et 1800 MHz, qui se situent entre celles d'un émetteur de télévision et celles d'un four à micro-ondes.
La puissance d'émission d'un téléphone mobile est nettement intérieure à celle d'une station de base. Cependant, la charge exercée sur l'organisme lors d'une conversation par portables interposés est beaucoup plus forte que celle de la station de base, même la plus puissante. Car si l'antenne de la station de base est généralement éloignée de plusieurs mètres au moins de la personne qui téléphone, le portable n'est lui qu'à quelques millimètres de son oreille.
L’intensité des immissions provenant d'une station de base dépend des facteurs suivants :

* La puissance de rayonnement : l'intensité des immissions augmente avec la puissance de rayonnement.
* La distance par rapport à l'antenne d'émission : l'intensité des immissions est réduite de moitié lorsque la distance est multipliée par deux.
* L’orientation par rapport à l'antenne : les antennes des stations de base ne rayonnent pas avec la même intensité dans toutes les directions. Elles sont comparables à une lampe de poche: elle éclaire horizontale-ment et dans un rayon de 120¾ et 180¾; au-delà de ce faisceau lumineux, la lumière ne disparaît pas totalement mais elle est nettement estompée.
* Les murs et la toiture : ils réduisent l'intensité des rayonnements qui pénètrent à l'intérieur du bâtiment.

L’illustration montre de manière schématique comment les immissions perçues aux abords d'une station de base d'une puissance d'émission de 700 watts varient en fonction de la distance et de l'angle d'exposition par rapport au faisceau de rayonnement. Les pourcentages indiqués se réfèrent à la valeur limite internationale d'immissions pour la bande de fréquence de 900 MHz. A l'extérieur de la zone en bleu foncé (100%), la valeur limite d'immissions est respectée.
Si l'on compare les immissions les plus fortes à proximité d'une station de base avec les valeurs limites d'immissions reconnues sur le plan international, on constate qu'il suffit de s'éloigner de quelques mètres de l'antenne pour que ces valeurs soient inférieures aux limites fixées. A égale distance de l'antenne, les immissions mesurées dans le faisceau de rayonnement sont les plus fortes, elles le sont nettement moins sous l'antenne et encore moins à l'intérieur d'un bâtiment situé directement sous l'antenne.


La tête est la partie du corps la plus exposée aux rayonnements du téléphone mobile et la charge reçue est nettement plus forte que celle provenant des stations de base.
L’intensité de rayonnement d'un téléphone mobile dépend des facteurs suivants :

* La puissance d'émission: l'intensité des immissions augmente avec la puissance d'émission.
* La distance qui sépare la tête de l'antenne: de ce point de vue, les combinés disposant de l'option "mains libres" sont préférables à ceux qui obligent l'utilisateur à appliquer l'antenne contre l'oreille.
* La conception du téléphone cellulaire et de l'antenne: différentes possibilités permettent de réduire l'intensité des rayonnements absorbés par la boîte crânienne.



L’illustration montre comment les rayonnements pénètrent dans la tête. C'est dans la zone de l'oreille que la charge est la plus forte, puis elle diminue considérablement dès qu'elle entre plus profondément à l'intérieur de la tête.



Quelle est la différence entre un téléphone mobile et un téléphone sans fil?


Le téléphone sans fil fonctionne selon le même principe que le téléphone mobile. Cependant, la puissance d'émission est nettement plus faible, puisque la distance qui sépare la station de base (au domicile> du combiné ne dépasse pas 300 mètres. La puissance d'émission du combiné est la même que celle de la station de base: environ 0,01 W.


Les rayonnements des stations de base et des portables sont-ils dangereux pour notre santé ?


Les effets des rayonnements électromagnétiques sur notre système biologique, et par conséquent sur notre santé, varient en fonction de leur intensité, de leur fréquence et de la durée d'exposition

L’exposition à des champs à haute fréquence de forte intensité provoque des effets thermiques : l'énergie est absorbée par le corps et transformée en chaleur. Si l'élévation de la température du corps dépasse 1¾ à 2¾ C, les effets sur l'organisme humain sont similaires à ceux provoqués par une fièvre ou une forte chaleur: diminution de l'activité cérébrale, dysfonctionnements des différentes fonctions corporelles et conséquences sur la reproduction. Les organes les moins irrigués, comme les yeux, évacuent moins bien la chaleur, ils s'échauffent donc plus rapidement et sont davantage fragilisés. Les effets thermiques ont en commun qu'ils n'apparaissent pas en deçà d'une certaine intensité.

Les valeurs limites d'immissions ont été déterminées de manière à éviter de tels échauffements. Comme ces valeurs sont respectées par les téléphones cellulaires et aux endroits faciles d'accès à proximité des stations de base, aucun effet thermique n'est à craindre.



A la différence des effets thermiques engendrés par une exposition à un rayonnement de forte intensité, les réactions biologiques dues à un rayonnement de faible intensité sont encore mal connues. Mais si l'existence d'effets "non thermiques" était mise en doute il y a encore quelques années, il est aujourd'hui indéniable que l'incidence thermique n'est pas la seule influence des rayonnements à haute fréquence sur l'organisme humain.

Par exemple, des changements physiologiques ont été constatés dans les cultures de cellules et chez les animaux ainsi que des modifications de l'activité électrique du cerveau humain. L’état actuel des connaissances ne permet cependant pas de savoir comment de tels effets se produisent, ni s'ils constituent un danger pour notre santé, d'autant plus que les résultats d'une partie des expériences menées ne sont pas reproductibles et sont même parfois contradictoires. Les recherches doivent donc se poursuivre pour déterminer les effets des rayonnements de faible intensité aux environs des stations de base et leurs influences sur notre santé, en particulier leurs conséquences à long terme qui n'ont encore jamais été étudiées.

Le téléphone mobile peut-il provoquer le cancer ?

De nombreuses études ont confirmé que les rayonnements à haute fréquence, même de forte intensité, ne peuvent modifier le patrimoine génétique. Ils ne sont donc pas cancérigènes. Toutefois, il n'est pas exclu qu'ils favorisent le développement des tumeurs existantes.

De vastes enquêtes sont menées actuellement auprès de groupes d'utilisateurs de téléphones mobiles.
Les résultats ne sont pas encore disponibles.

Le téléphone mobile peut-il être à l'origine de maux de tête ou d'insomnies ?

Des études réalisées en Scandinavie ont révélé que les personnes qui utilisaient fréquemment leur téléphone mobile se plaignaient plus souvent de maux de tête, de sensations de fatigue et de brûlures de la peau que les utilisateurs occasionnels. Il reste cependant à déterminer si ces symptômes sont dus aux rayonnements du téléphone cellulaire ou aux journées stressantes que vivent les accros du portable.

Une étude menée en laboratoire a montré que les phases de sommeil de volontaires exposés aux rayonnements d'un téléphone mobile placé à 40 cm de leur tête pendant une nuit avaient été modifiées. Des recherches supplémentaires sont nécessaires pour déterminer dans quelle mesure ces troubles pourraient également être générés par les immissions, nettement plus faibles, des stations de base.

Le téléphone mobile peut-il perturber le fonctionnement des prothèses auditives ?

Le téléphone mobile émet un rayonnement pulsé susceptible de perturber certaines prothèses auditives lorsqu'elles sont situées à moins d'un mètre environ du combiné et de créer ainsi des bourdonnements d'oreille chez le porteur d'un tel appareil.

Les personnes qui portent ce type de prothèse peuvent néanmoins utiliser un téléphone mobile après s'être renseignées sur la compatibilité entre les deux appareils (les petites prothèses placées à l'intérieur de l'oreille sont moins sensibles aux rayonnements que les dispositifs plus volumineux fixés à l'extérieur de l'oreille). Les fabricants proposent par ailleurs des solutions qui évitent à l'utilisateur de plaquer le téléphone mobile directement contre son oreille.

Quels effets un téléphone mobile peut-il avoir sur un stimulateur cardiaque ?

Le rayonnement pulsé des téléphones cellulaires peut perturber le fonctionnement de certains stimulateurs cardiaques, chaque appareil réagissant différemment aux interférences. Notons que des perturba-tions sont à craindre uniquement lorsque c'est le porteur d'un stimula-teur cardiaque qui téléphone. Le risque est maximum lorsque le téléphone mobile est enclenché et situé directement contre le stimulateur, par exemple dans une poche intérieure. Avant d'utiliser un téléphone mobile, le porteur de ce type de stimulateur doit se renseigner auprès de son médecin sur la compatibilité entre les deux appareils.

Existe-t-il des valeurs limitant le rayonnement des portables?

La Suisse a adopter des prescriptions fixant des valeurs limites d'immissions pour les stations de base : l’ordonnance du Conseil fédéral de 23.12.1999 sur la protection contre le rayonnement non ionisant (ORNI). Ces valeurs sont fondées sur les effets aigus des rayonnements à haute fréquence qui ont été scientifiquement prouvés et sont 50 fois inférieures aux seuils à partir desquels des effets thermiques nocifs apparaissent. Si elles sont respectées, ces valeurs limites préviennent donc tout effet thermique nuisible.

Les valeurs limites des rayonnements des stations de base et des téléphones mobiles s'expriment en différentes unités :

En ce qui concerne les stations de base, c'est l'intensité des champs électriques qui est limitée. Celle-ci reflète en effet l'intensité du rayonnement électromagnétique et peut être mesurée sur place à l'aide d'un appareil. Dans le domaine de la radiocommunication mobile, les valeurs limites d'immissions pour l'intensité des champs électriques, exprimées en volt par mètre (V/m), sont les suivantes :

Intensité des champs électriques

Valeur limite d'immissions

41 V/m pour la bande de fréquence de 900 MHz
58V/m pour la bande de fréquence de 1800 MHz

(pour les endroits où les personnes peuvent séjourner momentanément)

Valeur limite d'installation

4 V/m pour la bande de fréquence de 900 MHz
6 V/m pour les bandes de fréquence de 1800 MHz et plus

(pour les endroits où les personnes peuvent séjourner longuement)

En ce qui concerne les téléphones mobiles, ce sont les doses effectives de rayonnement absorbées par l'organisme humain qui sont limitées. Il s'agit de déterminer la puissance de rayonnement local absorbée par la tête pour 10 grammes de tissu (tissu cérébral, oeil, etc.). La valeur limite est ici indépendante de la fréquence de rayonnement :

Taux d'absorption spécifique

2 watts par kg ou 0,02 watts pour 10 g de tissu organique.

Notons cependant qu'en pratique, il n'est pas possible de mesurer directement la puissance de rayonnement absorbée par la tête (il faudrait pour cela introduire une sonde dans la boîte crânienne de la personne qui téléphone). Des programmes informatiques et des tests réalisés en laboratoire sur des mannequins permettent néanmoins de vérifier si les rayonnements du téléphone mobile qui pénètrent dans le crâne ne dépassent pas les valeurs limites.

Doit-on se contenter de respecter les valeurs limites?

La loi sur la protection de l'environnement vise à limiter le plus possible les risques pour l'environnement, même si l'on ne peut (pour l'instant) apporter la preuve d'un danger pour l'homme et son environnement. En d'autres termes "mieux vaut prévenir que guérir". Ce principe s'applique également au portable, justement parce que les effets à long terme des rayonnements de faible intensité sont encore mal connus.

Résumé de la brochure

Rayonnements et santé
La téléphonie mobile

De l'office fédéral de la santé publique.


Date de création : 22/08/2005 @ 09:38
Dernière modification : 22/08/2005 @ 09:41
Catégorie : Comment fonctionne la télécommunication mobile


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INFORMATION

Sondage
L'ELECTROSMOG ?
 
J'y crois
c'est n'importe quoi
il faudrait mesurer
=problèmes de santé
je dors mal
je suis électrosensible
il faut supprimer les portables
je fais confiance aux autorités
c'est une affaire de fric
supprimer les grosses antennes
Résultats

Traducteur

      

 


RATS EXPOSES
rat1.jpg
Dégâts aux cellules nerveuses de cerveaux de mammifères après exposition à des micro-ondes de téléphones mobiles GSM
L'été dernier, le neurochirurgien Leif Slaford et ses collègues de l'université de Lund en Suède publièrent des données montrant pour la première fois un lien non ambigu entre les rayonnements émis par les téléphones mobiles GSM (le type le plus courant au monde) et les dommages au cerveau des rats.

Entre temps, le monde de la recherche se rue pour répliquer les résultats surprenant de Salford. Son équipe exposa 32 rats durant 2 heures à des rayonnements de micro-ondes venant de téléphones cellulaires GSM. Les chercheurs attachèrent les téléphones sur les côtés de petites cages de rats en utilisant des câbles co-axiaux - permettant des expositions intermittentes directes - et ils firent varier l'intensité du rayonnement dans chaque groupe de traitement afin de refléter la plage d'expositions qu'un utilisateur humain peut connaître sur une période égale de temps. 50 jours après une seule exposition de 2 heures, les cerveaux des rats présentèrent des fuites importantes à travers les vaisseaux sanguins aussi bien que des zones de neurones endommagés et rétrécis. Plus le niveau de rayonnement fut élevé et plus les dommages furent apparents. Le groupe de contrôle, par opposition, ne montra aucun dommage. "Si les cerveaux humains sont affectés de façon similaire, dit Salford, les dommages pourraient produire des déficits mentaux à long terme mesurables."

antennes Yverdon


Agrandir


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