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     umbrella itself owns. robots.txt names both. RadiMeter and M-Phreefiteq moved to
     radimeter.radiation-lab.com and disposal.radiation-lab.com (2026-10-06) and each declares
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     lastmod is here because Google uses it to decide when a page is worth
     re-crawling, and this page had no signal at all: a title and a description
     rewritten on 2026-09-17 were still showing the previous wording in results
     hours later. lastmod does not force a crawl, and an inaccurate one is worse
     than none because Google learns to ignore the file — so gate/check-sitemap.mjs
     compares it against the last commit that touched public/ and fails if it drifts.

     The image entries name the pictures this page shows: since 2026-10-28 (plan A) those are the three
     workbench cards — screens of Field Pro and M-Phreefiteq, and the owner's drawing for RadiMeter. The
     hero plate left the page that day. Each entry is the <img src> (800w); gate/check-sitemap.mjs
     compares the two sets both ways. It does not make a search thumbnail appear — that stays Google's
     choice — but it declares the image as belonging to this page. og.jpg is deliberately absent: it is
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      <image:title>RadiMeter: isometric drawing of an instrument test room with irradiator, positioning stage and control station</image:title>
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      <image:loc>https://radiation-lab.com/img/wb-m-phreefiteq-800.webp</image:loc>
      <image:title>M-Phreefiteq: equilibrium results for the Se-79 oxidizing groundwater example</image:title>
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