Azah C K, Amoako J K, Fletcher J J
Radiation Protection Institute, Ghana Atomic Energy Commission, PO Box LG80, Legon, Accra, Ghana.
Radiat Prot Dosimetry. 2013 Oct;156(4):395-400. doi: 10.1093/rpd/nct089. Epub 2013 Apr 7.
Heightened awareness of the ever-expanding use of radiofrequency (RF) techniques and technology has led to mounting concerns from the general public and the scientific community regarding the possible health effects that may arise as a consequence of exposure to RF radiations and has drawn the attention of many researchers the world over. A survey of the RF electromagnetic radiation at public access points in the vicinity of 20 frequency-modulated (FM) radio stations has been made in Accra, Ghana. The fundamental object was to determine the levels of RF fields from FM broadcast antennae within 10-200 m radius about the foot of the FM base station and at a height of 1.5 m above the ground at selected locations. A spectrum analyser and a bi-conical antenna element sensitive and effective within the frequency band of 30-300 MHz were used. Results obtained indicated that the levels of electric field strength ranged from 5.4E-04 V m(-1) at FM station 'O' to 7.4E-08 V m(-1) at FM station 'D'. At a transmission frequency range of 88-108 MHz, the variation of power densities is from 2.5E-10 to 1.5E-17 Wm(-2). These values are very low and are far below the reference level set by the International Commission on Non-Ionizing Radiation Protection and therefore do not pose any known hazard to the inhabitants of Accra, Ghana. The electric field levels presented in this work are comparable with those reported from epidemiological studies conducted elsewhere.
随着人们对射频（RF）技术和科技不断扩大应用的认识日益提高，公众和科学界对因接触射频辐射可能产生的健康影响愈发担忧，这也引起了全球众多研究人员的关注。在加纳阿克拉，对20个调频（FM）广播电台附近公共接入点的射频电磁辐射进行了一项调查。其根本目的是确定调频基站底部半径10 - 200米范围内以及选定位置地面上方1.5米高度处调频广播天线的射频场强水平。使用了一台频谱分析仪和一个在30 - 300兆赫兹频段内灵敏且有效的双锥形天线元件。所得结果表明，电场强度水平在调频电台“O”处为5.4E - 04伏/米，在调频电台“D”处为7.4E - 08伏/米。在88 - 108兆赫兹的传输频率范围内，功率密度变化范围为2.5E - 10至1.5E - 17瓦/平方米。这些数值非常低，远低于国际非电离辐射防护委员会设定的参考水平，因此对加纳阿克拉的居民不构成任何已知危害。本研究中呈现的电场水平与其他地方进行的流行病学研究报告结果相当。
