en Radiation Biology Radiation Biology تحقيق بديع Original Research <p /><p /><p align="center"> <span style="FONT-WEIGHT: bold; language: EN; mso-ansi-language: EN">ABSTRACT</span></p><p /><p class="MsoNormal" style="DIRECTION: ltr; unicode-bidi: embed; TEXT-ALIGN: left; mso-pagination: widow-orphan"><span style="language: EN; mso-ansi-language: EN; mso-bidi-language: FA"></span></p><p /><p class="MsoNormal" style="TEXT-JUSTIFY: inter-word; DIRECTION: ltr; LINE-HEIGHT: 200%; unicode-bidi: embed; TEXT-ALIGN: justify; mso-pagination: none"><span style="FONT-WEIGHT: bold; language: EN; mso-ansi-language: EN; mso-bidi-language: FA">Background:</span><span style="language: EN; mso-ansi-language: EN; mso-bidi-language: FA"> There are relatively rich uranium mines in regions of Saghand and Bafgh in Yazd province. This survey was carried out to provide a map of ambient gamma radiation of Yazd province and the probable effects of the existence of these mines on background radiation dose rates.</span></p><p /><p class="MsoNormal" style="TEXT-JUSTIFY: inter-word; DIRECTION: ltr; LINE-HEIGHT: 200%; unicode-bidi: embed; TEXT-ALIGN: justify; mso-pagination: none"><span style="FONT-WEIGHT: bold; language: EN; mso-ansi-language: EN; mso-bidi-language: FA">Materials and Methods:</span><span style="language: EN; mso-ansi-language: EN; mso-bidi-language: FA"> The measurements of the outdoor and indoor–environmental exposures (including cosmic and terrestrial components) were accomplished by a portable Geiger Muller detector in the five areas in each of eight big cities of Yazd province.</span></p><p /><p class="MsoNormal" style="TEXT-JUSTIFY: inter-word; DIRECTION: ltr; LINE-HEIGHT: 200%; unicode-bidi: embed; TEXT-ALIGN: justify; mso-pagination: none"><span style="FONT-WEIGHT: bold; language: EN; mso-ansi-language: EN; mso-bidi-language: FA">Results: </span><span style="language: EN; mso-ansi-language: EN; mso-bidi-language: FA">The average exposure rates of indoor and outdoor ambient of Yazd province were 13.9 ±0.7 </span><span style="FONT-FAMILY: ">µ</span><span style="language: EN; mso-ansi-language: EN; mso-bidi-language: FA">Rh</span>^{<span style="language: EN; mso-ansi-language: EN; mso-bidi-language: FA">-1</span>}<span style="language: EN; mso-ansi-language: EN; mso-bidi-language: FA"> and 11.6 ±0.8 </span><span style="FONT-FAMILY: ">µ</span><span style="language: EN; mso-ansi-language: EN; mso-bidi-language: FA">Rh</span>^{<span style="language: EN; mso-ansi-language: EN; mso-bidi-language: FA">-1</span>}<span style="language: EN; mso-ansi-language: EN; mso-bidi-language: FA"> respectively. The average dose rates in air, resulting from gamma background radiation of indoor and outdoor were 122±6.8 nSvh</span>^{<span style="language: EN; mso-ansi-language: EN; mso-bidi-language: FA">-1</span>}<span style="language: EN; mso-ansi-language: EN; mso-bidi-language: FA"> and 101.4 ±7.4 nSvh</span>^{<span style="language: EN; mso-ansi-language: EN; mso-bidi-language: FA">-1</span>}<span style="language: EN; mso-ansi-language: EN; mso-bidi-language: FA"> respectively. The annual average of equivalent dose in air was found to be 1.03 ± 0.05 mSv, and the annual average of effective dose was 0.72 mSv.</span></p><p /><p class="MsoNormal" style="TEXT-JUSTIFY: inter-word; DIRECTION: ltr; LINE-HEIGHT: 200%; unicode-bidi: embed; TEXT-ALIGN: justify; mso-pagination: none"><span style="FONT-WEIGHT: bold; language: EN; mso-ansi-language: EN; mso-bidi-language: FA">Conclusion:</span><span style="language: EN; mso-ansi-language: EN; mso-bidi-language: FA"> The results of this study in comparison with the same measurements in some other cities in Iran such as Isfahan and Tabriz, proves that the existence of uranium mines doesn’t affect gamma background radiation of Yazd province.</span></p><p /><p class="MsoNormal" style="mso-pagination: none"><span dir="ltr" style="DIRECTION: ltr; FONT-FAMILY: "> </span></p><p /> ,Background radiation,annual effective dose, cosmic rays,terrestrial Radiation 17 20 http://www.ijrr.com/browse.php?a_code=A-10-1-119&amp;slc_lang=en&amp;sid=en F. Bouzarjomehri bouzarj_44@yahoo.com 79003194753284600335 Yes Department of Medical Physics, and Environmental health, Shahid Sadoghi University of Medical Sciences, Yazd, Iran M.H Ehrampoush 79003194753284600336 No Department of Medical Physics, and Environmental health, Shahid Sadoghi University of Medical Sciences, Yazd, Iran