Ionactive interactive

This widget is used to run Monte Carlo calculations to demonstrate the inverse-square law of radiation intensity at 1m and 2m from a point source of radiation. The widget is accompanied by a set of notes by Dr Chris Robbins from Grallator (who designed the widget),  explaining the basics of how the calculations are performed, and includes a summary of the mathematics of the Monte Carlo method.

Radon gas measurements in the UK are expressed as activity per unit volume (e.g. Bq per cubic metre of air). It is often useful to express this radon concentration as a dose or dose rate (micro Sv or micro Sv/h), which can then be used to present and compare radon exposure risk with something more tangible (like cosmic radiation during a flight at 40,000 feet). This calculator will do just that. 

Radiation shielding data for use with F-18 (inclusive of an interactive F-18 shielding calculator) Provides examples of lead thickness against transmission, and compares with concrete (3 densities considered) and steel. Based on broad beam conditions. Useful for shielding sanity checks during the initial design of PET shielding facilities.

Imagine an uncollimated radioactive source (e.g. Se-75 or similar) in the middle of a concrete shielded enclosure which is open topped.  The shielding is designed to mitigate all direct radiation from the source down to background levels on the outside of the enclosure. Any remaining exposure potential is from skyshine. This latest widget explores skyshine in terms of dose rate where the horizontal and vertical measurement position can be explored, and where the vertical height of the source can be adjusted. Some of the results provided may surprise you. Developed for Ionactive by Dr Chris Robbins from Grallator.

You are performing a critical examination on an x-ray cabinet where you find a small radiation "leak" measuring slightly >1 micro Sv/h on the surface. What is the potential whole body radiation exposure from this situation? How does it vary with the position of the source (x-ray collimator) to the inner surface of the x-ray cabinet covers? And how does it vary with the diameter of the shielding deficiency or the distance of the monitoring prob to the x-ray cabinet covers? Explore these radiation protection questions with this widget.  Developed for Ionactive by Dr Chris Robbins from Grallator.

How does a radiation protection maze (labyrinth) work? What dose rate would you receive if you were to move up the maze (if you were allowed to). No dog-leg (so you need a shielding door), one dog-leg or two dog-leg? How about a drop down lintel? Collimated source or uncollimated? Area of collimation? Scatter vs direct ray path? Mazes are often present in radiotherapy treatment rooms, industrial radiography enclosures, industrial irradiation facilities and similar. This widget uses a 10 MV collimated and uncollimated ionising radiation source to explore these concepts. In addition, the widget is used to describe good, and not so good practice in radiation shielding design, with practical examples. Developed for Ionactive by Dr Chris Robbins from Grallator.