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There may be a way to test the gravitational field of positrons, using Tc99m2
It would require a supply of this isotope suspended in a non aqueous solvent, three accelerometers in a common thermal "bottle" directly above and to the side of the isotope and cooling the solution between the Y123 plates down to 77K so the Y123 can superconduct.
Any positron emitting isotope could be used, and MgB2 could be substituted for Y123 but cooled to 39K instead of 77K. My reasoning is that if a superconductor can act as a gravitational wave amplifier in this context then the weak field from the positrons should be amplified to detectable levels.
EDIT: Spoke to someone about this, and they suggested I contact the EBME department to see how hard it would be to source some Tc99m2 to test this in the lab. I'd need to make the two plates with less than a 1mm gap, and seal the edges with some sort of resin that withstands LN2 but this is more of an engineering problem. Superconductors do generate strong EM fields if spun, this is a little known effect but needs to be accounted for.
EDIT: Might have a problem here, can't get hold of magnesium at all. MgCO3 might be a possibility though, we will have to see if that works.
Am I right in saying that it is possible to make Mg by heating MgCO3 in a vacuum and providing something more volatile to absorb the oxygen such as sodium? -A
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CERN antigravity experiment