Introduction to arcpy Debugging
Application programming using arcpy involves accessing ESRI applications through the arcpy library, containing modules for GUI support, geoprocessing, data access, mapping, spatial analysis, and more. Python 2.7 is used in ArcDesktop/ArcMap, while ArcGIS Pro uses version 3.5. Key differences between Python 3 and Python 2.7 are highlighted for transitioning. It is essential to avoid picking up bad habits from Python 2.
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Radiation Protection Officer dental radiography - basic Risk analysis Frits Pleiter 16/03/2025 01:30 radiation protection officer - thk 1
possible cases 1. patient 2. unborn child 3. dentist 4. waiting room 5. street 6. upstairs neighbours 7. accident 16/03/2025 01:30 radiation protection officer - thk 2
Patient direct beam ? equivalent dose ? yes, on the salivary gland(s) Hsalivary = Hskin = 5 mSv = 5000 Sv scattering radiation ? equivalent dose ? yes, on the thyroid opening PID = 4 cm 5 cm = 20 cm2 scattering radiation = Hskin / 1000 per 100 cm2 at 1 m Hscatter = (5000 Sv / 1000) (20 cm2 / 100 cm2) = 5 Sv 0,2 = 1 Sv distance skin - thyroid = 0,1 m Hthyroid = Hscatter (1 m / 0,1 m)2 = 1 Sv 100 = 100 Sv effective dose ? wsalivary = 0,01 / 6 = 0,0016 for 1 gland wthyroid = 0,04 Epatient = (0,0016 5000 Sv) + (0,04 100 Sv) = 8 Sv + 4 Sv = 12 Sv 16/03/2025 01:30 radiation protection officer - thk 3
Unborn child direct beam ? no scattering radiation ? equivalent dose ? yes, on the total body scattering radiation according to rule of thumb = 1 Sv per photo at 1 m distance skin - child = 0,5 m Hchild = 1 Sv (1 m / 0,5 m)2 = 4 Sv effective dose ? wbody = 1 Echild = 1 4 Sv = 4 Sv background = 1600 Sv/y / 365 d/y = 4 Sv per day 16/03/2025 01:30 radiation protection officer - thk 4
Dentist direct beam ? no scattering radiation ? equivalent dose ? yes, on the total body scattering radiation according to rule of thumb = 1 Sv per photo at 1 m distance skin - dentist = 3 m no shielding Hdentist = 1 Sv (1 m / 3 m)2 = 0,1 Sv annual effective dose ? wbody = 1 number of photos = 2000 per year Edentist = 1 0,1 Sv 2000 = 200 Sv annual limit = 1 mSv 16/03/2025 01:30 radiation protection officer - thk 5
Waiting room direct beam ? equivalent dose ? perhaps Hskin = 5 mSv distance focus - skin = 0,2 m distance focus - waiting room = 2 m no shielding Hwaiting room = 5 mSv (0,2 m / 2 m)2 = 0,05 mSv scattering radiation ? yes, but the contribution is negligible annual effective dose ? wbody = 1 number of photos = 2000 per year, half of which in the direction of the waiting room Ewaiting room = 1 0,05 mSv (2000 / 2) = 50 mSv annual limit = 1 mSv 16/03/2025 01:30 radiation protection officer - thk 6
Street direct beam ? equivalent dose ? perhaps Hskin = 5 mSv distance focus - skin = 0,2 m distance focus - waiting room = 3 m no shielding Hstreet = 5 mSv (0,2 m / 3 m)2 = 0,02 mSv scattering radiation ? yes, but the contribution is negligible annual effective dose ? wbody = 1 number of photos = 2000 per year, half of which in the direction of the street Estreet = 1 0,02 mSv (2000 / 2) = 20 mSv annual limit = 10 Sv 16/03/2025 01:30 radiation protection officer - thk 7
Upstairs neighbours direct beam ? no scattering radiation ? equivalent dose ? yes, on the total body scattering radiation according to rule of thumb = 1 Sv per photo at 1 m distance skin - neighbours = 3 m Hneighbours = 1 Sv (1 m / 3 m)2 = 0,1 Sv wbody = 1 number of photos = 2000 per year Eneighbours = 1 0,1 Sv 2000 = 200 Sv annual limit = 10 Sv annual effective dose ? 16/03/2025 01:30 radiation protection officer - thk 8
Accident unintended unlikely not impossible scenario thyroid and all six salivary glands in the direct beam equivalent dose ? Hskin = 5 mSv Hsalivary = Hthyroid = Hskin effective dose? wsalivary = 0,01 wthyroid = 0,04 Eaccident = (0,01 + 0,04) 5 mSv = 0,25 mSv annual limit = 1 mSv thus no reason to panic 16/03/2025 01:30 radiation protection officer - thk 9
