Equivalent half-value layers.
Burns
J E
JE
National Physical Laboratory, Teddington, Middlesex.
D000535:Aluminum; D002138:Calibration; D003300:Copper; D006801:Humans; D011874:Radiometry / Q000592:standards; D011879:Radiotherapy Dosage / Q000592:standards*; D012015:Reference Standards; D014964:X-Ray Therapy / Q000592:standards*
D003300:Copper; D000535:Aluminum