radiation   3323

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SHREC
Making new high performance rad hard computer designs. One is now being used for Lockheed LM50 SmartSat bus chassis core. Apparently powerful enough to run both SDR and a hypervisor for VM's and containers.
SHREC  space  high  performance  computer  computing  radiation  resistant 
yesterday by asteroza
The Saga of a Stranded Space Station Supercomputer
Spaceborne Computer

"they are what contracting wonks call commercial off-the-shelf (or COTS)"

customer replaceable units (CRUs)
ISS  supercomputer  radiation  Sun  PopularMechanics  JoePappalardo  HP  SpaceX  NASA  power  programming  server  deepspace 
yesterday by cosmic
atient Shielding in Diagnostic Imaging: Discontinuing a Legacy Practice
OBJECTIVE. Patient shielding is standard practice in diagnostic imaging, despite growing evidence that it provides negligible or no benefit and carries a substantial risk of increasing patient dose and compromising the diagnostic efficacy of an image. The historical rationale for patient shielding is described, and the folly of its continued use is discussed.

CONCLUSION. Although change is difficult, it is incumbent on radiologic technologists, medical physicists, and radiologists to abandon the practice of patient shielding in radiology.
radiation  risk 
yesterday by observer1959
Woman casually leaves URANIUM WASTE at city dumpster, sparks radiation scare — RT World News
A hazmat squad responded after a bucket full of radioactive waste was found near a trash can in Minsk, Belarus. The materials were marked with radiation symbols, which did not stop a local woman from taking them out like trash.
A bucket with cans made of glass and plastic and sporting distinctive radioactivity warning signs were discovered by a stunned communal service worker in Minsk on Thursday. The bucket was placed near a trash can at a dumpster in a residential district.

The vigilant worker immediately alerted emergency services, which dispatched a hazardous materials unit to check for radiation exposure. Once the team arrived at the scene, which was sealed off in precaution, they discovered that the level of radiation within one meter (3.2ft) of the bucket was four times higher than normal.
Belarus  public  discovery  response  radiation  waste 
6 days ago by dchas
A One-Page Guide to Fixing Radiated Emissions
Radiated emissions are a measure of how much electronic noise an electronic product emits into its surroundings. The government sets limits on this noise with the goal of regulating the limited electronmagnetic spectrum available to legitimate transmitters - i.e., wireless communications.

That’s a delightful description, but not a particularly useful. I’m willing to bet that, if you’re reading this page, “radiated emissions” likely means “a test your design is failing”.
radiation  EMI 
7 days ago by euler
The Chernobyl Disaster And The Radioactive Ghost Town Of Pripyat It Left
When a reactor overheated and human error compounded the damage, disaster had only just begun. Chernobyl's contamination can still be felt to this day. The Chernobyl disaster of April 25 and 26, 1986, was the most catastrophic nuclear accident of the 20th century. via Pocket
IFTTT  Pocket  chernobyl  nucleare  radiation 
22 days ago by cristianconti
Grand Canyon museum: Experts dispute claim that uranium radiation was risk • AZ Central
Dennis Wagner:
<p>The US Occupational Safety and Health Administration and the Arizona Bureau of Radiation Control are investigating the matter with the Park Service, and have declined comment on Stephenson’s assertion. Instead, they say readings at the building — taken after the contents of the buckets were dumped into a defunct uranium mine — show no danger.

As the controversy went viral this week, however, a number of experts declared that uranium is simply not a threat to humans, and questioned either the radiation readings taken by the Park Service or Stephenson’s interpretation of that data.

“It’s just a bucket of rocks,” declared Craig Little, a health physicist who worked 25 years at the Oakridge National Laboratory and now serves as a consultant at uranium producing facilities. “I wouldn’t line my baby’s crib with it, but …”

Little and Modi Wetzler, a chemistry professor at Clemson University who studies nuclear waste, said there are three types of radiation, and uranium ore emits almost exclusively the least-dangerous alpha particles.

Wetzler said alpha particles  are hazardous if inhaled or swallowed, but not externally dangerous because they can be absorbed and rendered harmless by a sheet of paper, a few inches of air, or a person’s outer layer of dead skin.

“The safety manager doesn’t know what he’s talking about,” Wetzler said. “Uranium ore would have a (radiation) value of zero. Either that, or it’s not ore and there’s some communication problem.”</p>


This is indeed true: uranium <a href="https://www.epa.gov/radiation/radionuclide-basics-uranium">decays through an alpha particle (helium nucleus) pathway</a>. So - as I faintly suspected in the first place - this is a big fuss about nothing, as with so many stories about rAdIaTiOn. (Thanks Seth F for the followup link.)
uranium  radiation 
25 days ago by charlesarthur

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