TM2 old source tray and TM4 optic tray are stored together in vault tray#9. The fielding measurement at SHC post 0.5 meter distance:
 

March 1st 2019, maximum 14.6msv/hr, minimum 4.78 msv/hr

Nov 2nd 2020, max 7.11m sv/hr, min 2.5msv/hr.