PHYS291 Project Documentation
This is the documentation for a project in PHYS291. PHYS291 is an UiB-course aimed at giving an introduction to computer science and using IT-resources for master thesis. The course requirement is a project in which C++ should be used in Linux environment with the CERN-developed data analysis framework ROOT.Project description - Results - git log - Code
By Ola S Grøttvik
Radon gas in basements and other closed spaces is a serious radiation source and is often the biggest contribution to the yearly radiation dose. It is therefore neccessary to make measurements and find which areas that are most affected and which houses the radiation reach dangerous levels. The activity can be measured by placing coal boxes in the areas where the radiation is predicted to be significant. The boxes contain activated carbon which have small, low-volume pores that increase the surface area availeble for adsorption or chemical reactions. This means that the carbon can adsorb quite a portion of radon. The boxes should be open in about 72 hours, and then be analysed within a day or so. The radon levels can then be measured by detecting the gamma radiation.
To find the amount of radiation we need the amount of counts minus the counts resulting from the background:
Ntot = Nbox - Nbackground
The radiation in Bq/m3 is calculated from the formulas above. R is the radon concentration, N the amount of counts, while C1 and C2 are correction factors. They are based on how much time that has passed since the box were closed before it was measured, and how long the box have been opened. Lambda is the deintegration constant for Rn-222 and therefore is ln2/91,68.
The initial project goals