(if a flag for this already exists, consider this an alt!)
radiajectum / radiation objectum/conceptum
one who is attracted to radiation, AKA radiation objectum or radiation conceptum. this can be any type of attraction, not inherently romantic/sexual.
i used the modern radiation warning colours for the center circle (yellow and black), green because its the colour most commonly associated with radiation in media (plus it reminds me of uranium glass), and blue and pink are for historic radiation warning colours (and also, cherenkov radiation and other accounts of radiation being blue!)
[image ID: a rectangular flag with 5 vertical stripes. the colours of the stripes, from left to right, are: vibrant cerulean, black, neon green, black, hot pink. in the center of the flag is a yellow circle with a black outline. inside of the circle is a black radiation trefoil. end image ID.]