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@Pinboard

Do not attempt to compete with Pinboard. http://pinboard.in  maciej@ceglowski.com +1 415 610 0231

Boulevard of broken dreams
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    1. Pinboard‏ @Pinboard Oct 18
      Replying to @Robotbeat @CJHandmer @dingir_bhaak

      You have this wrong; GCR radiation dose is four times as intense on a trip to Mars as it is over an equivalent period on ISS, and includes cosmic rays at lower energies that don't reach LEO.

      1 reply 0 retweets 0 likes
    2. Robotbeat 🗽 ➐‏ @Robotbeat Oct 18
      Replying to @Pinboard @CJHandmer @dingir_bhaak

      Right. And ISS includes a bunch of trapped radiation from the lower part of the Van Allen belts (the South Atlantic Anomaly) which isn’t present in deep space. To account for different effects on tissue, we adjust by the Quality Factor. That’s already included in the Sievert unit

      1 reply 0 retweets 2 likes
    3. Pinboard‏ @Pinboard Oct 18
      Replying to @Robotbeat @CJHandmer @dingir_bhaak

      And the Mars transit exposure for this radiation in Sieverts, with all fudge factors applied, is over four times that of ISS

      1 reply 0 retweets 0 likes
    4. Robotbeat 🗽 ➐‏ @Robotbeat Oct 18
      Replying to @Pinboard @CJHandmer @dingir_bhaak

      No, you looked purely at GCR and not total dose.

      1 reply 0 retweets 0 likes
    5. Pinboard‏ @Pinboard Oct 18
      Replying to @Robotbeat @CJHandmer @dingir_bhaak

      I'm talking about GCR because that is the radiation type we don't have good data on.

      1 reply 0 retweets 0 likes
    6. Robotbeat 🗽 ➐‏ @Robotbeat Oct 18
      Replying to @Pinboard @CJHandmer @dingir_bhaak

      Except we do. We have years of data on it. Low energy GCR is most similar to the trapped radiation ISS. So AGAIN, you have to use Sieverts which already adjusts for the different effects, not cherry-picking just GCR.

      2 replies 0 retweets 1 like
    7. Pinboard‏ @Pinboard Oct 18
      Replying to @Robotbeat @CJHandmer @dingir_bhaak

      We don't have the data on what deep-space GCR does to humans, because we have never gone there and there is not such an environment on Earth. GCR flux in deep space includes heavy nuclei whose cumulative effect on eyes, bone, etc. is conjectural. You can't handwave that away.

      2 replies 0 retweets 0 likes
    8. Pinboard‏ @Pinboard Oct 18
      Replying to @Pinboard @Robotbeat and

      We've put mice in front of a particle beam; that's about the extent of what we know about the biological impact of heavy ion radiation.

      1 reply 0 retweets 0 likes
    9. Robotbeat 🗽 ➐‏ @Robotbeat Oct 18
      Replying to @Pinboard @CJHandmer @dingir_bhaak

      Did you somehow forget ISS again? The heavy ion high energy GCRs are not deflected by the magnetosphere and impact ISS the same as in deep space minus some shielding from Earth itself (which lowers the dose rate but doesn’t eliminate it).

      2 replies 0 retweets 1 like
    10. Imitation Sagan Meat‏ @fakecarlsagan Oct 18
      Replying to @Robotbeat @Pinboard and

      Yup, it's the atmosphere that (partially) protects us from those.

      1 reply 0 retweets 0 likes
      Pinboard‏ @Pinboard Oct 18
      Replying to @fakecarlsagan @Robotbeat and

      Big fan of the atmosphere personally

      12:35 PM - 18 Oct 2021
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Robotbeat 🗽 ➐‏ @Robotbeat Oct 18
          Replying to @Pinboard @fakecarlsagan and

          Mars has one. It helps a lot.

          1 reply 0 retweets 1 like
        3. Derek Fox‏ @partialobs Oct 18
          Replying to @Robotbeat @Pinboard and

          Uh…. no, it won’t (sorry!)

          0 replies 0 retweets 0 likes
        4. End of conversation

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