Tungsten
10/15/2018
	Google searached down ~12 levels for "tungsten ultrasonic ultrasound". Nothing significant found beyond what already have.
	
Explain difference between NDT wave speed and dilitational wave speed (one of my clients was confused).

Effect of temperature -
	Thermal expansion (density)
		See my derivation.
		See Elementary Classical Physics, Vol 1, p. 482