Isotopes when written out are common nouns, and should begin with the uncapitalized element name, followed by a hyphen (not an em dash or en dash) and then the mass number. Examples are carbon-14 and uranium-235.
The central region of the kidney contains the renal pelvis, which is located in the renal sinus, and is continuous with the ureter. The renal pelvis is a large cavity that collects the urine as it is produced. The periphery of the renal pelvis is interrupted by cuplike projections called calyces.
NOTE: The kidneys collect urine in a section called the pelvis. The pelvis and its subdivisions (calyces) empty urine into a tube called the ureter, which leads to the bladder. http://www.nlm.nih.gov/medlineplus/ency/article/000525.htm. [Note & Link added -- Zb].