Ionactive interactive

A simple and useful radioactive decay calculator with Half-Life analysis and visual plotting. Select your radioactive material of choice, choose the decay period and calculate the remaining radioactivity. Will allow reverse calculations, so you can back calculate historic radioactivity based on the activity now. These features can be extended to setting dates and then calculating decay between them.  Also calculate time taken to decay from activity A to smaller activity B. If you just want to look up a curated half-life just select the radionuclide of choice and it will be displayed below your selection. Decay calculation results are also presented as interactive plots which you can explore, zoom and save. 

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 by Dr Chris Robbins from Grallator with Ionactive. 

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.