A study on terrestrial background ionization radiation was carried out around active selected telecommunications sites in Port Harcourt. This study was done using Radalert 100 and the geographical position system (GPS). The exposure rate ranged from 0.033 to 0.141 with a mean value of 0.123±0.20 (mR/h) which is lower than the acceptable limit of 0.0133 (mR/h). The absorbed dose ranged from 287.1 nG/h to 1226.7 nGy/hr with a mean value of 1066.64±1769.6 nGy/hr, which is quite higher than the acceptable limit of 89.0 nGy/h. The annual effective dose ranged between 0.44 and 1.88 mSv/y, with a mean value of 1.642.7 mSv/y which is quite higher than the safe limit of 1.0 mSv/y. The excess lifetime Cancer Risk (ELCR) varied from 1.54 x10-3 to 6.58x10-3 with a mean value of 5. 72±9.5 mSv/y. The result from this study is higher than the acceptable limit of 0.29 x10-3 as recommended by UNSCEAR. This means that people living within these areas may be exposed to cancer in later life. The effective dose of the various organs (ED Organs) are within the recommended safe limit of ICRP. The testes and the bone marrow are the most sensitive to radiation with the percentage distribution of 18.0% and 16.0%. Since the Annual effective dose, absorbed dose, and excess lifetime cancer risk are higher than the world standard, the chances of contracting cancer related illnesses are significant. It is recommended that monitoring of the exposure rate to ionizing radiation within the environment should be carried out. Also, individuals should on regular basis request for specific organ dose test.
The evaluation of background ionizing radiation in some selected X-rays diagnostic centers in Port Harcourt has been carried out. This research was achieved with the used of Radex (RD 1212) radiation meter to measure the exposure rate due to ionizing radiation, and geographical coordinate system was employed to record the coordinates of the sampled locations. The exposure rate ranged from 0.14 to 0.22 μSv/h with a mean value of 0.180.03 μSv/h, this value was quite higher than the acceptable limit of 0.133μSv/h set by the international commission on radiological protection (ICRP). The computed annual equivalent dose ranged from 0.25 to 0.39 mSv/y with a mean value of 0.310.05 mSv/y, the annual effective dose equivalent (AEDE) dose varied from 0.17 to 0.27 mSv/y with a mean value of 0.220.35 mSv/y. This value is lesser than the safe limit of 1mSv/y as recommended by ICRP. The excess lifetime cancer risk (ELCR) ranged from 0.64x10-3 to 0.77x10-3 mSv/y with a mean value of 0.760.12x10-3 mSv/y which is quite higher than the safe limit of 0.29x10-3 (UNSEAR). Therefore, the diagnostic centers in Port Harcourt may not be radiologically safe to both occupational workers and patients who are radiologically diagnosed from the general public. Even though the signs of health risk issues are not physically pronounced the chances of contracting radiological health relative issues is still significant. Therefore, is it recommended that adequate steps should be taken to ensure that radiation leakage should be contained, if possible to the barest minimum.
The measurement of magnetic field intensity within Captain Elechi Amadi Polytechnic, Rumuola was carried out with the aid of a handheld Bentech (GM-3120) Model Electromagnetic Radiation Metre. A total of 6 sampled locations were recorded; randomly with six distinct measurement and their coordinates at each of the sampled location with the aid of the global system position satellite (GPS) device. The measurement took place between 2017 November to 2018 March. A minimum value of 0.3417 0.65 T was recorded at the Administrative Block and a maximum value of 1.9767 1.43 T at the Business Centre. The overall mean values of all the sampled locations all fall below the recommended limit for the outdoor magnetic field intensity exposure of 100T of the International Commission of Non-Ionizing Radiation Protection (ICNIRP). The outcome of the measurement reveals that the exposure to magnetic field intensity to staffs, students and commercial workers within the campus of the Captain Elechi Amadi Polytechnic poses no health hazard.
The presence of high indoor radon concentration in residential buildings is a major concern of the public worldwide. Measurements of the indoor radon concentration in some selected residential buildings made of different building materials within Okrika local Government Area, in Rives State, Nigeria, was carried out using a Corentium Digital Radon Detector. The maximum mean value of the indoor radon concentration recorded was 19.36 ± 2.26 Bq/m 3 for mud houses, and minimum mean value of 09.35±0.78 Bq/m 3 for houses made of cemented solid blocks and floored with ceramic tiles, with an overall mean of 11.70 ± 3.28 Bq/m 3 . This value is below the range of limit of 200 and 600 Bq/m 3 recommended by ICRP for residential buildings. Values of the computed annual absorbed dose rate varied from 0.24 ± 0.01 to 0.49 ± 0.03mSvy 1 , with an overall mean of 0.30 ± 0.08 mSvy -1 . This value is lower than the recommended ICRP intervention limit of between (3-10) mSvy -1 . The computed annual equivalent dose rate ranged from 0.58 ± 0.02 to 1.17 ± 0.08 mSvy -1 , with an overall mean of 0.71 ± 0.20 mSvy -1 . This value is lower than the maximum permissible limit of 1 mSvy -1 recommended by ICRP. The computed excess life cancer risk ranged from 2.
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