We claim the ornamental design for radiation protective headwear, as shown and described.
FIG. 1 is a front view of a radiation protective headwear in a state of use in which it is worn on a user's head;
FIG. 2 is a top view, off-center to the right, of the radiation protective headwear in a state of use in which it is worn on a user's head, a top view off-center to the left being a mirror image thereof;
FIG. 3 is a right side view of the radiation protective headwear in a state of use in which it is worn on a user's head;
FIG. 4 is a left side view of the radiation protective headwear in a state of use in which it is worn on a user's head;
FIG. 5 is a rear view of the radiation protective headwear in a state of use in which it is worn on a user's head; and,
FIG. 6 is a rear-right side perspective view of the radiation protective headwear in a state of use in which it is worn on a user's head, a rear-left side perspective view being a mirror image thereof.
The broken lines illustrate environment which forms no part of what is claimed or parts of the article which form no part of the claimed design.