Posted 02/25/2021 07:45 am
Hand held XRF instruments need to be used in association with other testing methods. XRF** only looks to the top surface layer of 0-5 microns thickness, does not examine what is in the core of the coin or ingot. For coins and struck bars, that means ping tone test, density diameter weight etc. None of these testing methods will damage a coin in any way, provided that they are done with care.
Ping tone test will detect a tungsten core.
OK to test cast bullion bars with chemical testing techniques, but for large bars ultrasound or X-Ray testing (not XRF) may be required also.
** XRF = X-Ray Floresence. X-Ray are reflected off the surface. Each atomic element has it's own X-ray floresence signature which can be analysed in proportion to those elements in the surface layer only.
Ping tone test will detect a tungsten core.
OK to test cast bullion bars with chemical testing techniques, but for large bars ultrasound or X-Ray testing (not XRF) may be required also.
** XRF = X-Ray Floresence. X-Ray are reflected off the surface. Each atomic element has it's own X-ray floresence signature which can be analysed in proportion to those elements in the surface layer only.
