Radiation at the Grand Canyon

MrIncredible

Is fintastic
https://www.usatoday.com/story/trav...sed-radiation-safety-manager-says/2905358002/

"For nearly two decades at the Grand Canyon in Arizona, tourists, employees, and children on tours passed by three paint buckets stored in the national park's museum collection building, unaware that they were being exposed to radiation.

Although federal officials learned last year that the 5-gallon containers were brimming with uranium ore and then removed the radioactive specimens, the park's safety director alleges nothing was done to warn park workers or the public that they might have been exposed to unsafe levels of radiation.

In a rogue email sent to all Park Service employees on Feb. 4, Elston "Swede" Stephenson — the safety, health and wellness manager — described the alleged cover-up as "a top management failure" and warned of possible health consequences.

"If you were in the Museum Collections Building (2C) between the year 2000 and June 18, 2018, you were 'exposed' to uranium by OSHA's definition," Stephenson wrote. "The radiation readings, at first blush, exceeds (sic) the Nuclear Regulatory Commission's safe limits. … Identifying who was exposed, and your exposure level, gets tricky and is our next important task." The building is located in Grand Canyon Village, Arizona.

In a Feb. 11 email to Acting Interior Secretary David Bernhardt and Deputy Inspector General Mary Kendall, Stephenson said he had repeatedly asked national park executives to inform the public, only to get stonewalled.

"Respectfully, it was not only immoral not to let Our People know," he added, "but I could not longer risk my (health and safety) certification by letting this go any longer."...."
 

Cycle61

What the shit is this...
Much more of a concern for the staff than any visitors, radiation exposure is cumulative over time, and a level high enough to sicken an occasional visitor would have had profound effects on a worker who was in the area regularly. Still a big deal, but mostly only a real concern for the park staff.

Also, the NRC's listed safe exposure limits are incredibly low.

I'd like to see some more detail, but it's probably not available to the public yet.
 

Cycle61

What the shit is this...
Okay, found an article with actual numbers:

https://www.azcentral.com/story/new...sed-radiation-safety-manager-says/2876435002/

Stephenson eventually obtained a report submitted by the Park Service's regional safety manager, confirming the area was "positive for radioactivity above background" and showing high levels near the taxidermy area.

The report indicated radiation levels at "13.9 mR/hr" where the buckets were stored, and "800 mR/hr" on contact with the ore. Just 5 feet from the buckets, there was a zero reading. The abbreviation, "mR" typically stands for milliroentgen, a measurement roughly equivalent to a millirem, according to the Nuclear Regulatory Commission.

The NRC says average radiation exposure in the United States from natural sources is 300 millirems per year at sea level, or 400 at high altitude.

The commission lists a maximum safe dosage for the public, beyond natural radiation, is no more than 2 millirems per hour, or 100 per year.

Digging up some dusty brain cells from the Navy nuke days...hang on.
 
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Schnellbandit

I see 4 lights!
Have they quantified the danger as in the absence of continued exposure what walking past the paint buckets was likely to do?

I can just see the ambulance chaser TV ads on the way.

Have you or a loved one passed by old paint cans in the Grand Canyon? Some of these cans held Uranium ore, not to be confused with ore from Uranus. The radiation present in the ore exceeded the maximum safe limits as stated by the government. You may be entitled to significant financial compensation so please call now, we have bean counting Geiger counters standing by. Call now at 1-834-Xzappau
 
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Cycle61

What the shit is this...
Most of the stuff in there is for power plant workers and other radiation exposure occupations.

We'll move over to the civilian side:

https://www.nde-ed.org/EducationResources/CommunityCollege/RadiationSafety/safe_use/exposure.htm

Non-radiation Workers and the Public
The dose limit to non-radiation workers and members of the public are two percent of the annual occupational dose limit. Therefore, a non-radiation worker can receive a whole body dose of no more that 0.1 rem/year from industrial ionizing radiation. This exposure would be in addition to the 0.3 rem/year from natural background radiation and the 0.05 rem/year from man-made sources such as medical x-rays.

So, for a source of 13.9mR/hour, an exposure to the source for 8 hours would give you 0.104 rem, which is the limit for non-radiation workers. Workers trained in radiation procedures are allowed up to 5 rems per year, far higher (and nobody ever actually gets anywhere near that number). So, a visitor sitting in the area for 30 minutes a couple time a year is fine. A ranger coming in to move papers around a couple times a week could certainly have exceeded the allowable dosage, although it's unlikely they actually experience any health effects. 800mr/hr (the readings in contact with the ore) is pretty high, if we had any hot spots in the power plant that high they would have been classified as exclusion areas and prohibited access for more than a few minutes at most.

Hopefully nobody was in the habit of using the buckets as a seat on their lunch break.

Somebody definitely fucked up allowing this to happen at all though.

Uranium is serious business.
 
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Cycle61

What the shit is this...
Have they quantified the danger as in the absence of continued exposure what walking past the paint buckets was likely to do?

Walking past them occasionally wouldn't present a danger. As mentioned above, radiation exposure is cumulative with time, and inversely proportional to distance. The article above noted that even five feet away from the buckets, readings dropped to zero.
 

Schnellbandit

I see 4 lights!
Walking past them occasionally wouldn't present a danger. As mentioned above, radiation exposure is cumulative with time, and inversely proportional to distance. The article above noted that even five feet away from the buckets, readings dropped to zero.

But when the general public gets this...you know what I mean? Consider 2nd hand smoke scares. Then the word cover-up and people start looking for third eyes.

I can understand not wanting to start a notification campaign. Too late for that.
 

Cycle61

What the shit is this...
Data point: I teabagged the reactor core on the nuclear powered aircraft carrier USS Abraham Lincoln. As did most of my coworkers. It was a thing everybody did when they had a chance. My nuts haven't fallen off. Unless it's some K19 Widowmaker level shit, basically the correct answer is don't spend too much time next to the thing.

I absolutely agree that the public has a right to know exactly what happened, and the NPS should probably offer to cover the cost of medical testing for anybody who visited the site and is concerned. And somebody(s) needs to lose their jobs at least for the attempted coverup.
 
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Blankpage

alien
Paint buckets sitting in the corner for 2 decades and no one considered maybe just cleaning up the place and throwing out whatever wasn't being used.
Wonder how often employees would sit their ass on them during break time.
 

Schnellbandit

I see 4 lights!
Data point: I teabagged the reactor core on the nuclear powered aircraft carrier USS Abraham Lincoln. As did most of my coworkers. It was a thing everybody did when they had a chance. My nuts haven't fallen off. Unless it's some K19 Widowmaker level shit, basically the correct answer is don't spend too much time next to the thing.

I absolutely agree that the public has a right to know exactly what happened, and the NPS should probably offer to cover the cost of medical testing for anybody who visited the site and is concerned. And somebody(s) needs to lose their jobs at least for the attempted coverup.

Yeah but you aren't telling us they don't glow in the dark either.:laughing

If social media doesn't run with this it might just go away.
 

Reli

Well-known member
And so why did these buckets contain uranium? They dug it up for a museum exhibit or something?
 

Cycle61

What the shit is this...
Yeah but you aren't telling us they don't glow in the dark either.:laughing

If social media doesn't run with this it might just go away.

That's my favorite party trick :teeth

I'll probably share the AZCentral article with my friends, it's worth knowing.
 

KWeezyXB12

SKRRRRRRRRRRRT!!!!!!
its actually just a old crapper tank
182830a9-102d-4e99-8c94-ae528c228323_screenshot.jpg
 
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