{HEAD ~ The filter body} is rotatable around the axle, which is permeable to {TAIL ~ the x ray radiation} 
{ HEAD ~ The filter body } is rotatable around the axle , which is permeable to { TAIL ~ the x ray radiation }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL