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DS Material Weekly Meeting (L.Luzzi) 24/05/2022 Minutes - Kracow: preliminary number of the pcb “positive” board, that we are able to compare with the other type of board. They got an other sample from UK. Now it is important to measure the negative one with the same procedure, in the way to make an intelligent comparison. - Surfactant: screening in Genova happened and they sent some sample to LNGS to cross check the procedure. Ge assays is the best way to assay that. Let’s talk offline where make this measurement and the way to make it faster. - Let’s talk offline about organize a dedicated meeting about surface contamination. - About Pula meeting, we should make a background call before that (thursday afternoon or friday afternoon?). Roberto will circulate an email about this. - Gosia: Uncertainty of the neutron yield. She went through the data and materials used and it is everything ok. But is this consistent with the overall picture? We have to comprove it. - Melba discovered form LZ papers that there is something better than stainless steel in terms of radiourity, but next week she will give more update about this.