java: cannot select the radio button "NoSuchElementException: that element does not exist: the element error cannot be located"

I am trying to select a radio button with 3 given radio buttons, but I don't get that item exception.

Here is the HTML code for the 3 radio buttons:

I am using this code to select the radio button:

WebElement Radio2 = driver.findElement(By.xpath("//img(contains(@alt, 'AltText2'))"));;