Skip to content
By using Twitter’s services you agree to our Cookies Use. We and our partners operate globally and use cookies, including for analytics, personalisation, and ads.
  • Home Home Home, current page.
  • About

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @
  • Language: English
    • Bahasa Indonesia
    • Bahasa Melayu
    • Català
    • Čeština
    • Dansk
    • Deutsch
    • English UK
    • Español
    • Filipino
    • Français
    • Hrvatski
    • Italiano
    • Magyar
    • Nederlands
    • Norsk
    • Polski
    • Português
    • Română
    • Slovenčina
    • Suomi
    • Svenska
    • Tiếng Việt
    • Türkçe
    • Ελληνικά
    • Български език
    • Русский
    • Српски
    • Українська мова
    • עִבְרִית
    • العربية
    • فارسی
    • मराठी
    • हिन्दी
    • বাংলা
    • ગુજરાતી
    • தமிழ்
    • ಕನ್ನಡ
    • ภาษาไทย
    • 한국어
    • 日本語
    • 简体中文
    • 繁體中文
  • Have an account? Log in
    Have an account?
    · Forgot password?

    New to Twitter?
    Sign up
Pinboard's profile
Pinboard
Pinboard
Pinboard
@Pinboard

Tweets

Pinboard

@Pinboard

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

Boulevard of broken dreams
pinboard.in
Joined July 2009

Tweets

  • © 2021 Twitter
  • About
  • Help Center
  • Terms
  • Privacy policy
  • Cookies
  • Ads info
Dismiss
Previous
Next

Go to a person's profile

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @

Promote this Tweet

Block

  • Tweet with a location

    You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more

    Your lists

    Create a new list


    Under 100 characters, optional

    Privacy

    Copy link to Tweet

    Embed this Tweet

    Embed this Video

    Add this Tweet to your website by copying the code below. Learn more

    Add this video to your website by copying the code below. Learn more

    Hmm, there was a problem reaching the server.

    By embedding Twitter content in your website or app, you are agreeing to the Twitter Developer Agreement and Developer Policy.

    Preview

    Why you're seeing this ad

    Log in to Twitter

    · Forgot password?
    Don't have an account? Sign up »

    Sign up for Twitter

    Not on Twitter? Sign up, tune into the things you care about, and get updates as they happen.

    Sign up
    Have an account? Log in »

    Two-way (sending and receiving) short codes:

    Country Code For customers of
    United States 40404 (any)
    Canada 21212 (any)
    United Kingdom 86444 Vodafone, Orange, 3, O2
    Brazil 40404 Nextel, TIM
    Haiti 40404 Digicel, Voila
    Ireland 51210 Vodafone, O2
    India 53000 Bharti Airtel, Videocon, Reliance
    Indonesia 89887 AXIS, 3, Telkomsel, Indosat, XL Axiata
    Italy 4880804 Wind
    3424486444 Vodafone
    » See SMS short codes for other countries

    Confirmation

     

    Welcome home!

    This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.

    Tweets not working for you?

    Hover over the profile pic and click the Following button to unfollow any account.

    Say a lot with a little

    When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.

    Spread the word

    The fastest way to share someone else’s Tweet with your followers is with a Retweet. Tap the icon to send it instantly.

    Join the conversation

    Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.

    Learn the latest

    Get instant insight into what people are talking about now.

    Get more of what you love

    Follow more accounts to get instant updates about topics you care about.

    Find what's happening

    See the latest conversations about any topic instantly.

    Never miss a Moment

    Catch up instantly on the best stories happening as they unfold.

    1. Pinboard‏ @Pinboard Oct 18
      Replying to @CJHandmer @Robotbeat @dingir_bhaak

      The specific issue threatening Mars missions is how bone injury from deep-space radiation couples with bone loss from microgravity. They are different mechanisms and we simply don't know how they interact.

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

      We’ve done super long trips in LEO which have both microgravity & radiation. The radiation (which includes some trapped radiation, BTW) was half as intense but trips lasted well over twice as long as transit. We’ve got some idea now. It’s simply no longer a complete question mark

      2 replies 0 retweets 1 like
    3. 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
    4. 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
    5. 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
    6. 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
    7. 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
    8. 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
    9. 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
    10. Robotbeat 🗽 ➐‏ @Robotbeat Oct 18
      Replying to @Pinboard @CJHandmer @dingir_bhaak

      I’m not handwaving it away; you’re falsely saying ISS is invalid. The data ISS has includes the highest energy heavy ion cosmic rays. As you yourself said: It’s only the low energy GCR (which is most like other radiation and has the least uncertainty) that is shielded away on ISS

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

      I'm not saying the ISS data is invalid, but incomplete. It doesn't include what gets deflected by the Earth's magnetosphere, and the overall flux on ISS (because Earth fills half the sky, and because of that magnetosphere) is much less than what you get roasted with in deep space

      12:34 PM - 18 Oct 2021
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Robotbeat 🗽 ➐‏ @Robotbeat Oct 18
          Replying to @Pinboard @CJHandmer @dingir_bhaak

          You aren’t saying it’s invalid? Bro, this you?pic.twitter.com/QwsoOy6ycy

          2 replies 0 retweets 1 like
        3. Show replies

      Loading seems to be taking a while.

      Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.

        Promoted Tweet

        false

        • © 2021 Twitter
        • About
        • Help Center
        • Terms
        • Privacy policy
        • Cookies
        • Ads info