Sign in or 
Location: Radiography
Discussion: Radiation protection
Category:
Discussion Forum /
General Discussion
Share this
Showing 3 posts
aqdem |
Radiation protection
Apr 14 2011, 11:39 AM EDT
Is it possible that 125 KV X Rays can pas through 300 mm concrete slab ?The X Ray room is on 1st floor and X Ray camara is positioned on table There is a waiting room on Ground floor dose these radeation will effect the person in the waiting room take good care of your self that is most Important regards Baig 1 out of 1 found this valuable. Do you? |
mrenfinger |
1. RE: Radiation protection
May 7 2011, 10:54 AM EDT
"Is it possible that 125 KV X Rays can pas through 300 mm concrete slab ?It is highly unlikely that this would penetrate the slab, even if pointed directly toward it. Remember, most of the radiation interacting with the slab will be scatter radiation, which is far less penetrating that the primary beam... I don't think you have anything to worry about. 1 out of 1 found this valuable. Do you? |
eliseleblanc |
2. RE: Radiation protection
May 11 2011, 1:55 AM EDT
Hi, At 125 kV, the half value layer (HVL) of concrete is 2 cm. This means half of the photons from the incident beam are absorbed in 2cm of concrete. Add another 2 cm, and it is reduced to 25%, etc... HVL=.693/μ μ=0.693/HVL μ=0.693/2cm μ=0.346 Using the intensity attenuation equation, I=(Io)e^(-μx), Assuming the incident beam is 100%... and 30 cm concrete slab... I=(Io)e^(-μx) I=100%e^(-0.346*30) I=0.003% So, the 30cm concrete slab reduces the intensity of the beam to 0.003% of the incident beam. Also, if you refer to a reference like the NCRP report #49 you will see that the 300mm concrete slab exceeds the requirements. You should check out Health Canada's Safety Code 35: http://www.hc-sc.gc.ca/ewh-semt/pubs/radiation/safety-code_35-securite/index-eng.php (especially pages 61-66). Conclusion: The dose to the person in the waiting room below is negligible. 3 out of 3 found this valuable. Do you? |
