You can see more details on the GitHub page for his project.
Elektor recently posted a comprehensive review of the MightyOhm Geiger counter kit, including this field survey around an abandoned Uranium mine.
To celebrate eight years since the release of my Geiger counter kit, for the next eight days you can purchase a kit with free economy shipping!
While supplies last. Be sure to select economy shipping at checkout (Priority Mail included for US customers). Offer expires at midnight pacific time on August 15th, 2019.