{"id":504,"date":"2026-10-31T16:23:54","date_gmt":"2026-10-31T08:23:54","guid":{"rendered":"https:\/\/yoyodyne.com.au\/?p=504"},"modified":"2026-10-31T16:23:55","modified_gmt":"2026-10-31T08:23:55","slug":"ircp-66-and-breathing-rates","status":"publish","type":"post","link":"https:\/\/yoyodyne.com.au\/index.php\/2026\/10\/31\/ircp-66-and-breathing-rates\/","title":{"rendered":"IRCP-66 and breathing rates"},"content":{"rendered":"\n

Also posted on LinkedIn, but posts on there disapear like smoke in the wind….<\/p>\n\n\n\n

https:\/\/lnkd.in\/p\/gkT8Vbiy<\/a><\/p>\n\n\n\n

So you’re minding your own business on a Saturday afternoon, casually reading ICRP-66 on the Human Respiratory Tract Model, and come across Table 6. For those who aren’t ‘initiated’, we generally use the worker breathing rate of 1.2 m3\/hr in mining when calculating work category or SEG annual doses from long-lived radioactive dust (LLRD).<\/p>\n\n\n\n

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My heart skipped a beat – have I been wrong all this time?<\/p>\n\n\n\n

No, of course not. And shame on you for thinking such a heresy. It turns out workers aren’t going full-tilt for 8 hours – the assumption is 5.5 hours of light exercise at 1.5 m3\/hr, then 2.5 hours of sitting around doing SFA at 0.54 m3\/hr. We’re not going to discuss the assumption that they never ‘do hard exercise’, a.k.a. work hard.<\/p>\n\n\n\n

Keep the derivation of “1.2 m3\/hr” in mind when extending worker shifts to 12 hours, as 5.5 and 2.5 may no longer be valid proportions over 12 instead of 8 hours.<\/p>\n\n\n\n

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Also posted on LinkedIn, but posts on there disapear like smoke in the wind…. https:\/\/lnkd.in\/p\/gkT8Vbiy So you’re minding your own business on a Saturday afternoon, casually reading ICRP-66 on the Human Respiratory Tract Model, and come across Table 6. For those who aren’t ‘initiated’, we generally use the worker breathing rate of 1.2 m3\/hr in […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-504","post","type-post","status-publish","format-standard","hentry","category-uncategorised"],"_links":{"self":[{"href":"https:\/\/yoyodyne.com.au\/index.php\/wp-json\/wp\/v2\/posts\/504","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yoyodyne.com.au\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yoyodyne.com.au\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yoyodyne.com.au\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yoyodyne.com.au\/index.php\/wp-json\/wp\/v2\/comments?post=504"}],"version-history":[{"count":1,"href":"https:\/\/yoyodyne.com.au\/index.php\/wp-json\/wp\/v2\/posts\/504\/revisions"}],"predecessor-version":[{"id":510,"href":"https:\/\/yoyodyne.com.au\/index.php\/wp-json\/wp\/v2\/posts\/504\/revisions\/510"}],"wp:attachment":[{"href":"https:\/\/yoyodyne.com.au\/index.php\/wp-json\/wp\/v2\/media?parent=504"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yoyodyne.com.au\/index.php\/wp-json\/wp\/v2\/categories?post=504"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yoyodyne.com.au\/index.php\/wp-json\/wp\/v2\/tags?post=504"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}