An turbine airfoil and a process for near wall cooling of a turbine airflow with low flow in which the airfoil is formed by a main spar that forms the support structure for the airfoil and forms a series of cooling air collecting chambers extending from the leading edge region to the trailing edge region of the airfoil. The emission of the phosphor under an excitation at 450 nm exhibits a peak in the range of maximum sensitivity of the human eye. Normal human breast and prostate tissue, excited in 270 to 300 nm range, express the emission signatures at 340 nm, 440 nm and 500 nm. In a preferred embodiment, the collet has a ramp on an inwardly facing surface that cams along a surface on the pilot, assisting the collet in expanding when a tube is moved into a housing. The second step defines a specific Gaussian elimination that separates the problem of solving quintic and sextic polynomial equations into a simpler problem of finding roots of a quadratic equation and a quartic equation. These steps are repeated until the lowest layer is attained.