When the photographic elements are intended to be exposed by x rays, they can include {TAIL ~ features} found in {HEAD ~ conventional radiographic elements} 
When the photographic elements are intended to be exposed by x rays , they can include { TAIL ~ features } found in { HEAD ~ conventional radiographic elements }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD