If you are getting notifications from RadianceChecked, then your Mac is infected with adware. RadianceChecked is adware for Mac.
RadianceChecked changes setting in your Mac. First, RadianceChecked installs a browser extension in your browser. Then, after RadianceChecked hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.