Home           Contact us           FAQs           
 
   Journal Page   |   Aims & Scope   |   Author Guideline   |   Editorial Board   |   Search
    Abstract
2012 (Vol. 4, Issue: 06)
Article Information:

Evaluation of the Biological Shields of the Secondary Standard Dosimetry Laboratory of Ghana Using MCNP5

P. Deatanyah, G. Emi-Reynolds, J.K. Amoako, C.C. Arwui, S. Wotorchi-Gordon, H. Lawluvi, D.O. Kpeglo and J. Annkah
Corresponding Author:  P. Deatanyah 

Key words:  Ambient dose equivalent, biological shielding, MCNP5, modeling, SSDL, ,
Vol. 4 , (06): 544-550
Submitted Accepted Published
2011 September, 16 2011 October, 15 2012 March, 15
Abstract:

The primary objective with radiation sources and facilities is the protection of both radiation workers and the general public. The biological shields of the Secondary Standard Dosimetry Laboratory of the Radiation Protection Institute (RPI) Ghana had been evaluated for a collimated isotropic cesium-137 source for calibration purpose using MCNP5 code. The dose rate at supervised areas ranged from 0.57 to 8.35 :Sv/h and 0.26 to 10.22 :Sv/h at control areas when the source was panoramic. When the source was collimated, the dose rate ranged from 0.05 to 0.30 :Sv/h at supervised areas and 0.23 to 8.88 :Sv/h at control areas for 22.2 GBq of the cesium-137 source. The scatter contribution from the surfaces of the walls and roofs were also accounted for. The scatter radiation in the room decreased to 400 :Sv/h when the source was first collimated and to 3.5 :Sv/h when the source was further collimated. These results agreed quite well with experimental measurement. To effectively protect the staff, a narrow beam of 1.2 cm diameter which was defined at 1.0 m by the total surface of the ISO slab phantom was recommended to reduce the dose rate to less than 1.5 :Sv/h outside the calibration bunker even when the current activity is doubled. It was concluded that the 4.7 cm diameter of the existing narrow beam should be decreased to 1.2 cm by further collimation of the beam.
Abstract PDF HTML
  Cite this Reference:
P. Deatanyah, G. Emi-Reynolds, J.K. Amoako, C.C. Arwui, S. Wotorchi-Gordon, H. Lawluvi, D.O. Kpeglo and J. Annkah, 2012. Evaluation of the Biological Shields of the Secondary Standard Dosimetry Laboratory of Ghana Using MCNP5.  Research Journal of Applied Sciences, Engineering and Technology, 4(06): 544-550.
    Advertise with us
 
ISSN (Online):  2040-7467
ISSN (Print):   2040-7459
Submit Manuscript
   Current Information
   Sales & Services
   Contact Information
  Executive Managing Editor
  Email: admin@maxwellsci.com
  Publishing Editor
  Email: support@maxwellsci.com
  Account Manager
  Email: faisalm@maxwellsci.com
  Journal Editor
  Email: admin@maxwellsci.com
  Press Department
  Email: press@maxwellsci.com
Home  |  Contact us  |  About us  |  Privacy Policy
Copyright © 2009. MAXWELL Science Publication, a division of MAXWELLl Scientific Organization. All rights reserved