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Mobile Phones and Brain Tumours - part 6

Họ phát hiện ra một dư thừa của các khối u ác tính ở động vật tiếp xúc, nhưng không có sự khác biệt trong tuổi thọ, không tăng trong bất kỳ loại cụ thể của khối u, và các khối u não không ác tính ở tất cả các | Mobile Phones and Brain Tumours 2008 G. Khurana - All Rights Reserved. i POSITIVE LABORATORY STUDIES - i.e. those studies that show an association between electromagnetic radiation and cellular changes that can lead to tumour development. o Chou and colleagues C.K. Chou et al. Long-term low-level microwave irradiation of rats Bioelectromagnetics 1992 Volume 13 pages 469-496 exposed rats to 2450 MHz RF energy for just over 2 years at a whole body specific absorption rate SAR of 0.15 - 0.4 W per kg current standard for SAR by the FCC is 1.6 W kg for the head or 0.080 W kg averaged over the body as defined by the International Commission on Non-Ionizing Radiation Protection ICNIRP guidelines . They found an excess of malignant tumours in exposed animals but no difference in life span no increases in any particular type of tumour and no malignant brain tumours at all. The study exposed animals to only 2 years of radiation instead of say 10 years and at possibly lower doses than currently permitted for cell phones alone although SAR for the rat head was not specified . The fact that there was an increase in the number of malignant tumours observed in exposed animals under these conditions certainly is of concern. o Repacholi and colleagues M.H. Repacholi et al. Lymphomas in Eu-Pim1 transgenic mice exposed to pulsed 900 MHz electromagnetic fields Radiation Research 1997 Volume 147 pages 631-640 exposed transgenic mice that were genetically engineered to be more prone to developing lymphomas to 900 MHz radiofrequency energy for 18 months at an specific absorption rate SAR of 0.008 - 4.2 W per kg the variation in SAR due to variations in mice size orientation and number remaining in cages . They found that the incidence of lymphoma in the exposed mice was significantly higher than in unexposed control mice suggesting a tumour-promoting effect of radiofrequency electromagnetic radiation. o Lai Singh reported increased levels of DNA damage in rat brain cells after exposure .