Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources in this section. This section needs additional citations for verification. Similarly a lockdown alert was likewise issued as a "Shelter-in-place" alert by the Massachusetts Emergency Management Agency over the cell phone Wireless Emergency Alerts service for local residents during the manhunt for the Boston Marathon bombing suspects. ![]() In light of active shooter events and the panic that can ensue, a lockdown alert issued as "shelter in place", can also be implemented as a response to armed events, such as the 2014 Fort Hood shootings. ![]() The public in the area is advised to carry out all the same tasks as a typical shelter-in-place but without the key step of sealing the shelter up to prevent outside air from circulating indoors, in this scenario people are simply urged to lockdown - stay indoors and "close, lock and stay away from external doors and windows." The phrase "shelter-in-place" has also erroneously been used, instead of the more accurate lockdown, to describe precautions to be taken by the public when violence has occurred or might occur (particularly in shootings) in the area and the perpetrator is believed to still be in the area but not apprehended. If an individual finds themselves outside during an emergency that calls for shelter-in-place, then effective but low-tech decontamination is required before entering into the shelter. Creating the following 7-10 rule-of-thumb after a typical nuclear detonation while under the conditions that all fallout that will fall on the land has done so completely and no further deposition in the area will occur - After 7 hours, the average dose rate outside is reduced by a factor of ten after 49(7x7) hours, it is reduced by a further factor of ten (to a value of 1/100th of the initial dose rate) after two weeks the radiation from the fallout will have reduced by a factor of 1000 compared to the initial level and after 14 weeks the average dose rate will have reduced to 1/10,000th of the initial level. The danger of radiation from radioactive precipitation/" fallout" decreases with time, as radioactivity decays exponentially with time, such that for each factor of seven increase in time, the radiation is reduced by a factor of ten. In the military, "Shelter-in-Place" is comparable to "buttoning up" and has proved life-saving in certain nuclear fallout instances. If the occupant's breathing is the only consumer of oxygen and producer of carbon dioxide in the room, then carbon dioxide levels would not begin to reach dangerous values until 3+ hours had passed, in most likely, 4-person home scenarios. Shelter-in-place effectiveness has been evaluated and experimental results show that proper sealing can make a substantial difference to a normal home shelter, finding it to be at least twice as effective against a host of airborne substances when compared against simply staying inside and not implementing the countermeasure, and in most airborne contaminant cases, it is usually much more effective, depending on the particle size of the substance in question. Federal Emergency Management Agency-affiliated website. Diagrams of what sheltering in place entails following a chemical, biological, radiological or nuclear (CBRN) threat, and how long it is advised to be done for, is provided by the U.S. Shelter in place in radiological and chemical defense scenarios entails closing all household doors, windows, and vents and taking immediate shelter in a readily accessible location that puts as much indoor air and radiation shielding-mass between the individual and the hazardous outside air, such as a basement or centrally located medium to small room, and trying to make it as airtight as possible by shutting off all ventilation/ HVAC systems and extensively sealing the shelter's doors and windows from all outside air contaminants with damp towels, or if available, plastic sheeting and adhesive tape. The American Red Cross says the warning is issued when "chemical, biological, or radiological contaminants may be released accidentally or intentionally into the environment" and residents should "select a small, interior room, with no or few windows, taking refuge there." Radiological and chemical defense Shelter-in-place ( SIP also known as a shelter-in-place warning, SAME code SPW) is the act of seeking safety within the building one already occupies, rather than evacuating the area or seeking a community emergency shelter. For the quarantine order, see Stay-at-home order.
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