4 ms·
Pentax Camera Radiates 2.7µSv
- hatsunearu 7y agoApparently lenses can be radioactive: https://camerapedia.fandom.com/wiki/Radioactive_lenses https://camerapedia.fandom.com/wiki/Radioactive_lenses
- dngray 7y agoYes, more specifically https://en.wikipedia.org/wiki/Thoriated_glass https://en.wikipedia.org/wiki/Thoriated_glass also: https://www.youtube.com/watch?v=sHjCKiXDIDc https://www.youtube.com/watch?v=sHjCKiXDIDc
- newsbinator 7y agoFor the non-physicists, how worrisome is this? In other words, how does this compare to eating bananas, getting dental x-rays, etc?
- jdietrich 7y agohttps://xkcd.com/radiation/ https://xkcd.com/radiation/
- teekert 7y agoThanx, I guess the title could use a "per what time unit" addition.
- deleted 7y ago[deleted]
- floatingatoll 7y agoIt's not. The XKCD is pretty solid, but if you like napkin-math, here's some. This is napkin-math quality only. I take no responsibility for personal irradiation choices. http://articles.adsabs.harvard.edu//full/1988JBAA...98..309F/0000310.000.html http://articles.adsabs.harvard.edu//full/1988JBAA...98..309F... Someone studied this back in 1988 and, if I read this right, if you're using a radioactive lens as an eyepiece (say, for a telescope) then the exposure limit for the eye back then was a cumulative 15 mSv per year. This camera emits (rounding up) 0.003 mSv/h, so you must only use it for 5000 hours per year. There's 8760 hours per year, so in order to reach the 15 mSv annual exposure limit, you'd need to hold this camera up to a single eye for ~13 hours a day for 365 days in order to reach annual exposure limits. TLDR: If you tape this camera to your skull in front of one eye for a year including while sleeping, you'd receive 26 mSv of exposure in that eye, exceeding the 1988 annual safe exposure limit of 15 mSv cited in a random paper from 1988. Most people will hold the camera up to their eye for less than this amount of time per year. TLDRTLDR: Do not use this camera as a cyborg attachment and you'll be fine.
- stefantalpalaru 7y ago> The XKCD is pretty solid No, it's full of shit. Based on tables that estimate the effect of various radioactive isotopes acting for 50 years, people ignoring physiology decided that the average K40 in a banana will produce 0.078 microsievert of damage (rounded to 0.1 because it's close enough for jazz and comics). The reality is that, due to homoeostasis, the excess potassium you ingest is eliminated the next time you piss, so there's no accumulation inside the organism. Those 50 years become something like 12 hours and the radiation exposure is more in the ballpark of 0.00000213 microsievert.
- ngcc_hk 7y agoI thought common knowledge. Some old lens used radioactive elements. But I was under the impression the glass protect quite a bit of it.
- anticodon 7y agoI've read that good isotopes emitting alpha and beta are slowly decaying and transforming into isotopes emitting gamma radiation. This is why old lenses can become dangerous after 40-50 years.
- Daviey 7y ago2.7? Not Great, Not Terrible.