Loong

general recent conversations

The h Bar

General chat for Physics SE (physics.stackexchange.com). For M...

Loong

Tue 17:44

The Finnish version of überfüllt.

Loong

Tue 17:44

Loong

Tue 17:19

Also the only thing of the "replied to" that doesn't link back is the arrow.

Loong

Jul 6 09:18

That might be a good thing after all.

Loong

May 18 14:14

@PM2Ring So don't be a J. K. Rowling.

Loong

May 18 10:42

I blame the "New feed items" in this chat.

Loong

May 18 10:41

But I guess the whole site is like that.

Loong

May 18 10:41

I didn't really want to; but it was xkcd.com/386

Loong

May 18 10:36

> If you don’t read the newspaper you are uninformed, if you do read the newspaper you are misinformed.

Loong

May 18 10:36

@JohnRennie The same applies to newspaper writers when they mistakenly attribute a different quote about uninformed newspaper readers to Mark Twain.

Loong

Mar 23 14:10

hence the letter h for Hilfsgröße (auxiliary quantity)

Loong

Feb 20 20:04

This only shows how old you have become in the meantime.

Loong

Feb 14 19:40

You don't learn much about reactor accidents, but a lot about cultural differences.

Loong

Feb 14 19:39

The Netflix series about Fukushima is closer to the reality.

Loong

Feb 14 19:39

But a few unnecessary factual mistakes can get you upset.

Loong

Feb 14 19:38

And I always liked Stellan Skarsgård.

Loong

Feb 14 19:38

I have to say, I enjoyed watching it, but mostly because of the dramaturgy.

Loong

Feb 14 19:35

It's not completely bad, but it allows itself a lot of artistic liberties. The presented science and nuclear technology have to be taken with a grain of salt.

Loong

Feb 14 19:19

The Ac-228 is from the natural Th-232 chain.

Loong

Feb 14 19:19

depending on the detector efficiency curve

Loong

Feb 14 19:18

With that Cs-137/K-40 ratio, it looks like a soil sample from Europe.

Loong

Feb 14 19:18

The Cs-137 is from Chernobyl.

Loong

Feb 14 19:13

Maybe it's a soil sample. Or the ash of a plant sample.

Loong

Feb 14 19:11

If he is using that reference, he should be fine. At least concerning the natural background in his sample.

Loong

Feb 14 19:08

okay

Loong

Feb 14 17:12

And the age of the sample doesn't mean much. Depending on the weather, there may be significant activity of new Be-7 in ground-level air and on surfaces.

Loong

Feb 14 16:59

What was that? A soil sample? It looks like one.

Loong

Feb 14 16:55

keV - peak
71.9 - x-Ray
74.2 - x-Ray
83.9 - x-Ray
238.4 - Pb-212
294.9 - Pb-214
300.2 - Pb-212
351.7 - Pb-214
477.7 - Be-7
511.2 - annihilation
583.3 - Ac-228
609.6 - Bi-214
662.1 - Cs-137
910.8 - Ac-228
964.3 - Ac-228
969.3 - Ac-228
1120.4 - Bi-214
1237.9 - Bi-214
1460.8 - K-40

Loong

Feb 14 16:55

@PM2Ring Looks okay, including a little bit of Chernobyl

Loong

Feb 13 20:47

@PM2Ring If it's an activated sample, it could also be Eu; but you would see many other peaks then.

Loong

Feb 13 20:35

What was the new NAA question?

Loong

Feb 13 20:35

There can be interference with the Compton edge of Cs-137, though.

Loong

Feb 13 20:34

@PM2Ring Be-7 would be the best guess for a peak around 477 keV from an environmental sample.

Loong

Feb 2 13:06

Why are you so fixed on 20 000 tons of TNT? There has never been a coordinated explosion of so much conventional explosives.

Loong

Feb 2 12:11

Yes, that's the one.

Loong

Feb 2 12:10

S-50 (Manhattan Project)

The S-50 Project was the Manhattan Project's effort to produce enriched uranium by liquid thermal diffusion during World War II. It was one of three technologies for uranium enrichment pursued by the Manhattan Project. The liquid thermal diffusion process was not one of the enrichment technologies initially selected for use in the Manhattan Project, and was developed independently by Philip H. Abelson and other scientists at the United States Naval Research Laboratory. This was primarily due to doubts about the process's technical feasibility, but inter-service rivalry between the United States...

Loong

Feb 2 12:07

@PM2Ring There was one during the Manhattan Project with maybe three dead or so.

Loong

Feb 2 11:53

I know a laboratory technician who opened a microwave digestion too early, before it had cooled down properly. She was just able to turn away; but with the marks on her back, she didn't wear bikinis after that.

Loong

Feb 2 09:39

yes, plastic

Loong

Feb 2 09:34

I can also still see a small scar where a drop has passed through two gloves.

Loong

Feb 2 09:33

It is fast. But I pulled the pipette out again right away, so the acid ran out and the reaction didn't go any further; so it didn't go through the glass. However, it was already white then.

Loong

Feb 2 09:27

@SignorFeynman I once accidentally used a glass measuring pipette for hydrofluoric acid because I was focused on something else in the workflow. Of course, I immediately noticed that something was wrong and pulled the pipette out again; but then it was already turning white.

Loong

Feb 2 08:39

But there are pickling baths.

The Periodic Table

Haikus are awesome / Chemistry's even better / So pull up a chair

Loong

Jul 19 11:36

Q: Semiconductors — physics or chemistry?

Where to ask? Lately I realized that my understanding of semiconductors was incomplete in many ways. I never questioned how the doping with different elements was realy accomplished, and I never thought about crystal defects without any impurities. Where to ask such questions?

Loong

Mar 15 11:26

@Poutnik ohh

Stack Exchange Lobby

The beginner-friendly chat room for all users on the Stack Exc...

Loong

Jul 13 14:40

So try Surströmming then

Loong

Jul 12 12:24

@JourneymanGeek maps.app.goo.gl/utVVaF5H5UAtX22UA

Loong

Jul 12 12:23

I like the Gripen, though. It is designed to take off from a country road in the cold Nordic winter and it only requires maintenance with a few basic servicemen without long specialized training.

Loong

Jul 12 12:20

@JourneymanGeek similar. It's close to a SAAB factory.

Loong

Jul 12 12:19

@JourneymanGeek I regularly pass by one that is placed along the highway.