Radura

Typically depicted in green, it features a plant design within a circular outline, with the circle's top section represented by dashes.

[1] The Radura symbol was created by inventors from the former Pilot Plant for Food Irradiation in Wageningen, Netherlands, which later evolved into the company known as Gammaster, now called Isotron.

[2] Initially introduced in the 1960s, the Radura symbol was exclusively used by a food irradiation pilot plant in Wageningen, Netherlands, which held the copyright.

Leemhorst played a crucial role in having the symbol included in the Codex Alimentarius Standard for irradiated food, providing an option for labeling such products.

In supermarkets where the irradiated mushrooms were on sale the logo was dominantly shown and buyers received a leaflet with information about the process and the advantages of the treated products.

The city of Berkeley, California, through its nuclear-free zone law, requires that food intended for human consumption be labeled "Treated with Ionizing Radiation".