Home Podcasts THMG176 – Shelter in Place Concepts, Part II

THMG176 – Shelter in Place Concepts, Part II


In this two-part series, we dissect the concepts for the seemingly constant struggle of, “Do I shelter in place or evacuate”. We break it down hazard by hazard, so sharpen those pencils.

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  1. Bio release
    1. Type of harm
      1. infections
    2. The reality of evacuation in some area
      1. I really don’t see this being a viable option.
        1. Bio release of anthrax
          1. Released and spread
          2. The plume is gone long after symptoms start to show up
      2. There may be a shelter in place but not in the sense that we think about it.
        1. More Bio isolation. PPE, Respirators, limit person contact so people who are inside more but not in the same sense as a chem release
    3. Things to consider when determining if a building is suitable
      1. Long term sustainability
        1. For bio, there is a need to think about long term sustainability.
          1. Getting away from infected population
          2. Infrastructure that is damage due to people being sick
            1. Supply chain
            2. Utilities
            3. Additional medical needs might be hindered due to overwhelming sick
    4. How to establish the safest inside environment
      1. Depend on the bio but other than swabs which take days to get back results or basic tests that are not reliable there is no way to really meter for safely.
      2. Bio can possibly stay around for a long time
        1. Take anthrax for example. The spores can sit and wait to be inhaled for a long time.
        2. Something like a virus not so much, but we’re talking the difference between a bio release vs trying to spread a sickness or introducing a sickness like smallpox in hopes it spreads.
    5. Information to population
      1. TV,
      2. Radio
      3. Loudspeaker
      4. Cell phone
  2. Dirty bomb
    1. Type of harm
      1. We’re not going to talk about the bomb aspect of this
      2. Radiation that we concerned about
    2. The reality of evacuation in some area
      1. The area of evacuation is most likely going to be small. The reality is more large chunks spread over small (couple hundred-yard area)
    3. Things to consider when determining if a building is suitable
      1. I think for a dirty bomb we want to have a good structure to block any radiation
      2. We will still want to do the HVAC but what’s nice is we can so easily monitor for radiation
    4. How to establish the safest inside environment
      1. Again we want to control the inside of the building. So shutting down the HVAC system is a good thing. And I want to draw a caveat here. We shut down hvac when the incident is outside to keep what’s outside from coming in. We shut down hvac if the incident is inside because we want to keep what’s in from spreading.
        1. We have to be smart about this. Shutting down an entire HVAC to a building like a highrise may not be possible or necessary. The systems might not exchange air with the outside.
    5. Information to population
      1. TV,
      2. Radio
      3. Loudspeaker
      4. Cell phone
  1. Nuclear detonation
    1. Type of harm
      1. Being contaminated by fall out.
        1. Well if your not vaporized by the heat or crushed in the building collapse
      2. Yes so here the rundown of what would happen in a detonation.
        1. The bomb goes off near the ground.
          1. The near ground part is important. An atmosphere blast doesn’t create as much fall out
            1. That because the fall out is produced by two separate events.
              1. First the actual vaporization of the material that is being fussed. These are un fissioned nuclear material and have really long half lives,
                1. But there is not a lot of material and depending on how high it explodes very little even comes down at on the ground. Some of it gets sucked up and spread around the atmosphere.
              2. The second event happens closer to the ground. The blast and rush of neurons and other radioactive material irritates all the dirt that is kicked up during the explosion. This dirt and large particles fall back to earth pretty quick. This is the fall out we think of when we think of an area being radioactive after a blast.
                1. Good news it it has a short half life. Bad news is it is bad if you inhale it.
                2. So we shelter in place for this type of fall out.
    2. Reality of evacuation in some area
      1. It is going to be big. This is a huge operation
      2. While plume modeling is going to help. Your not going to know the extent of the air without metering and monitoring.
      3. The same is true with the duration. Fall out might drop off quickly but your not going to be sure until you put a meter on it.
    3. Things to consider when determining if a building is suitable
    4. How to establish safest inside environment
      1. If you have people entering an area from outside try to have them do the following recommendations from the CDC.
        1. Remove clothing, shoes, and accessories before entering your shelter area.
        2. During severe weather, such as extreme cold, remove at least the outer layer of clothes before entering the home to avoid bringing radioactive material into your shelter. Leave clothing and shoes outside.
        3. Shower and wash your body with soap and water. Removing clothing can eliminate up to 90% of radioactive contamination. By taking this simple step, you will reduce the time that you are exposed and also your risk of injury from the radiation.
        4. Turn off fans, air conditioners, and forced-air heating units that bring air in from the outside. Close and lock all windows and doors, and close fireplace dampers

The Hazmat Guys

Author: The Hazmat Guys


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