China Capacitors are Radioactive

On 11 Feb 2018 09:12:02 GMT, Jasen Betts <jasen@xnet.co.nz> wrote:

On 2018-02-11, John Larkin <jjlarkin@highlandtechnology.com> wrote:
On 9 Feb 2018 19:20:40 GMT, Jasen Betts <jasen@xnet.co.nz> wrote:

On 2018-02-09, Ralph Mowery <rmowery28146@earthlink.net> wrote:
In article <c7f829cf-7b69-4e94-bd58-e4dfb920bc6f@googlegroups.com>,
billb@eskimo.com says...

On Tuesday, January 9, 2018 at 9:24:03 AM UTC-8, Jeroen Belleman wrote:

I learned today that there are places where people live and
are exposed to dose rates of the order of 100uSv/h,
https://en.wikipedia.org/wiki/Ramsar,_Mazandaran

They could sell all of their radioactive limestone on ebay.

But then their town would fall into the molten lava at the
center of the Earth.

Lots of things are radio active.

The salt subistute (potassium cloride) is often radio active, and people
eat that.

It's always radioactive. there are no stable isotopes of potassium.

Wiki says that 39 and 41 are stable.

hmm, yeah other places agree, I wonder how I got that idea, I had the
impression that 39 and 41 were just much less radioactive.
Click to expand...

K is about the hottest stuff commonly around. Two others are old red
(uranium colored) bricks, and thoriated Coleman lantern mantles.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics
 
On Sunday, February 11, 2018 at 9:35:43 PM UTC-5, John Larkin wrote:
On 11 Feb 2018 09:12:02 GMT, Jasen Betts <jasen@xnet.co.nz> wrote:

On 2018-02-11, John Larkin <jjlarkin@highlandtechnology.com> wrote:
On 9 Feb 2018 19:20:40 GMT, Jasen Betts <jasen@xnet.co.nz> wrote:

On 2018-02-09, Ralph Mowery <rmowery28146@earthlink.net> wrote:
In article <c7f829cf-7b69-4e94-bd58-e4dfb920bc6f@googlegroups.com>,
billb@eskimo.com says...

On Tuesday, January 9, 2018 at 9:24:03 AM UTC-8, Jeroen Belleman wrote:

I learned today that there are places where people live and
are exposed to dose rates of the order of 100uSv/h,
https://en.wikipedia.org/wiki/Ramsar,_Mazandaran

They could sell all of their radioactive limestone on ebay.

But then their town would fall into the molten lava at the
center of the Earth.

Lots of things are radio active.

The salt subistute (potassium cloride) is often radio active, and people
eat that.

It's always radioactive. there are no stable isotopes of potassium.

Wiki says that 39 and 41 are stable.

hmm, yeah other places agree, I wonder how I got that idea, I had the
impression that 39 and 41 were just much less radioactive.

K is about the hottest stuff commonly around. Two others are old red
(uranium colored) bricks, and thoriated Coleman lantern mantles.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics
Click to expand...

Bismuth (one of my favorite elements) is just barely radioactive.
~10^19 years according to wiki.

George H.
 
On 02/09/2018 10:33 AM, Ralph Mowery wrote:
In article <c7f829cf-7b69-4e94-bd58-e4dfb920bc6f@googlegroups.com>,
billb@eskimo.com says...

On Tuesday, January 9, 2018 at 9:24:03 AM UTC-8, Jeroen Belleman wrote:

I learned today that there are places where people live and
are exposed to dose rates of the order of 100uSv/h,
https://en.wikipedia.org/wiki/Ramsar,_Mazandaran

They could sell all of their radioactive limestone on ebay.

But then their town would fall into the molten lava at the
center of the Earth.

Lots of things are radio active.

The salt subistute (potassium cloride) is often radio active, and people
eat that.
Click to expand...

Always! Fortunately the body's homeostasis keeps the K ion
concentration reasonably constant.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com
 
On 02/12/2018 09:17 AM, George Herold wrote:
On Sunday, February 11, 2018 at 9:35:43 PM UTC-5, John Larkin wrote:
On 11 Feb 2018 09:12:02 GMT, Jasen Betts <jasen@xnet.co.nz> wrote:

On 2018-02-11, John Larkin <jjlarkin@highlandtechnology.com> wrote:
On 9 Feb 2018 19:20:40 GMT, Jasen Betts <jasen@xnet.co.nz> wrote:

On 2018-02-09, Ralph Mowery <rmowery28146@earthlink.net> wrote:
In article <c7f829cf-7b69-4e94-bd58-e4dfb920bc6f@googlegroups.com>,
billb@eskimo.com says...

On Tuesday, January 9, 2018 at 9:24:03 AM UTC-8, Jeroen Belleman wrote:

I learned today that there are places where people live and
are exposed to dose rates of the order of 100uSv/h,
https://en.wikipedia.org/wiki/Ramsar,_Mazandaran

They could sell all of their radioactive limestone on ebay.

But then their town would fall into the molten lava at the
center of the Earth.

Lots of things are radio active.

The salt subistute (potassium cloride) is often radio active, and people
eat that.

It's always radioactive. there are no stable isotopes of potassium.

Wiki says that 39 and 41 are stable.

hmm, yeah other places agree, I wonder how I got that idea, I had the
impression that 39 and 41 were just much less radioactive.

K is about the hottest stuff commonly around. Two others are old red
(uranium colored) bricks, and thoriated Coleman lantern mantles.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

Bismuth (one of my favorite elements) is just barely radioactive.
~10^19 years according to wiki.

George H.
Click to expand...

Europium is also very mildly radioactive--half of it is Eu 151, which
has a half life of (5 +- 10)E18 years, i.e.

Ten years or so ago, I needed to put down some europium films to make
fancy tunnel junctions, and I couldn't because the thin film folks at
Watson weren't allowed to use radioactive materials. :(

A one-gram evaporator target would emit one alpha particle on average in
a time

t = 1/(6.02e23 atoms/mol * 1g/ 151g/mol * ln(2) / (5e18 y * 3.16e7 s/y))

= 57175 seconds, i.e. about one every 16 hours.

Sigh.

Cheers

Phil Hobbs


--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com
 
On Mon, 12 Feb 2018 17:45:47 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

On 02/12/2018 09:17 AM, George Herold wrote:
On Sunday, February 11, 2018 at 9:35:43 PM UTC-5, John Larkin wrote:
On 11 Feb 2018 09:12:02 GMT, Jasen Betts <jasen@xnet.co.nz> wrote:

On 2018-02-11, John Larkin <jjlarkin@highlandtechnology.com> wrote:
On 9 Feb 2018 19:20:40 GMT, Jasen Betts <jasen@xnet.co.nz> wrote:

On 2018-02-09, Ralph Mowery <rmowery28146@earthlink.net> wrote:
In article <c7f829cf-7b69-4e94-bd58-e4dfb920bc6f@googlegroups.com>,
billb@eskimo.com says...

On Tuesday, January 9, 2018 at 9:24:03 AM UTC-8, Jeroen Belleman wrote:

I learned today that there are places where people live and
are exposed to dose rates of the order of 100uSv/h,
https://en.wikipedia.org/wiki/Ramsar,_Mazandaran

They could sell all of their radioactive limestone on ebay.

But then their town would fall into the molten lava at the
center of the Earth.

Lots of things are radio active.

The salt subistute (potassium cloride) is often radio active, and people
eat that.

It's always radioactive. there are no stable isotopes of potassium.

Wiki says that 39 and 41 are stable.

hmm, yeah other places agree, I wonder how I got that idea, I had the
impression that 39 and 41 were just much less radioactive.

K is about the hottest stuff commonly around. Two others are old red
(uranium colored) bricks, and thoriated Coleman lantern mantles.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

Bismuth (one of my favorite elements) is just barely radioactive.
~10^19 years according to wiki.

George H.


Europium is also very mildly radioactive--half of it is Eu 151, which
has a half life of (5 +- 10)E18 years, i.e.

Ten years or so ago, I needed to put down some europium films to make
fancy tunnel junctions, and I couldn't because the thin film folks at
Watson weren't allowed to use radioactive materials. :(

A one-gram evaporator target would emit one alpha particle on average in
a time

t = 1/(6.02e23 atoms/mol * 1g/ 151g/mol * ln(2) / (5e18 y * 3.16e7 s/y))

= 57175 seconds, i.e. about one every 16 hours.

Sigh.

Cheers

Phil Hobbs
Click to expand...

Antique stores sometimes have old radium-dial clocks. Once you are
dark adapted, if you look at them up close, there is a cool alpha-shot
dancing pattern. You can see single alpha events.

They make nice pulses into a PMT too. I made it to the National
Science Fair doing that. Baltimore that year. Ugh.



--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
 
On Mon, 12 Feb 2018 17:30:41 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

On 02/09/2018 10:33 AM, Ralph Mowery wrote:
In article <c7f829cf-7b69-4e94-bd58-e4dfb920bc6f@googlegroups.com>,
billb@eskimo.com says...

On Tuesday, January 9, 2018 at 9:24:03 AM UTC-8, Jeroen Belleman wrote:

I learned today that there are places where people live and
are exposed to dose rates of the order of 100uSv/h,
https://en.wikipedia.org/wiki/Ramsar,_Mazandaran

They could sell all of their radioactive limestone on ebay.

But then their town would fall into the molten lava at the
center of the Earth.

Lots of things are radio active.

The salt subistute (potassium cloride) is often radio active, and people
eat that.



Always! Fortunately the body's homeostasis keeps the K ion
concentration reasonably constant.

Cheers

Phil Hobbs
Click to expand...
Yes, the biological half life must also be considered when one is
exposed to radioactive compounds. I read a few good books on
radioactivity, radiation, and the biological consequences of exposure
to same before I had radioactive seeds implanted. I even used a nice
digital display geiger counter to monitor the decay over time. Not
very accurate considering I just held the counter against the same
approximate spot once a day. But I did emit more than the safe exposre
limit for about a month. So I had to keep the cats from sitting on my
lap for a while. My wife too. I missed my wife more than the cats.
Eric
 
On 02/12/2018 08:04 PM, etpm@whidbey.com wrote:
On Mon, 12 Feb 2018 17:30:41 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 02/09/2018 10:33 AM, Ralph Mowery wrote:
In article <c7f829cf-7b69-4e94-bd58-e4dfb920bc6f@googlegroups.com>,
billb@eskimo.com says...

On Tuesday, January 9, 2018 at 9:24:03 AM UTC-8, Jeroen Belleman wrote:

I learned today that there are places where people live and
are exposed to dose rates of the order of 100uSv/h,
https://en.wikipedia.org/wiki/Ramsar,_Mazandaran

They could sell all of their radioactive limestone on ebay.

But then their town would fall into the molten lava at the
center of the Earth.

Lots of things are radio active.

The salt subistute (potassium cloride) is often radio active, and people
eat that.



Always! Fortunately the body's homeostasis keeps the K ion
concentration reasonably constant.

Cheers

Phil Hobbs
Yes, the biological half life must also be considered when one is
exposed to radioactive compounds. I read a few good books on
radioactivity, radiation, and the biological consequences of exposure
to same before I had radioactive seeds implanted. I even used a nice
digital display geiger counter to monitor the decay over time. Not
very accurate considering I just held the counter against the same
approximate spot once a day. But I did emit more than the safe exposre
limit for about a month. So I had to keep the cats from sitting on my
lap for a while. My wife too. I missed my wife more than the cats.
Eric

Hopefully the plumbing recovered!
Click to expand...

Cheers

Phil Hobbs


--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com
 
On Monday, February 12, 2018 at 5:46:01 PM UTC-5, Phil Hobbs wrote:
On 02/12/2018 09:17 AM, George Herold wrote:
On Sunday, February 11, 2018 at 9:35:43 PM UTC-5, John Larkin wrote:
On 11 Feb 2018 09:12:02 GMT, Jasen Betts <jasen@xnet.co.nz> wrote:

On 2018-02-11, John Larkin <jjlarkin@highlandtechnology.com> wrote:
On 9 Feb 2018 19:20:40 GMT, Jasen Betts <jasen@xnet.co.nz> wrote:

On 2018-02-09, Ralph Mowery <rmowery28146@earthlink.net> wrote:
In article <c7f829cf-7b69-4e94-bd58-e4dfb920bc6f@googlegroups.com>,
billb@eskimo.com says...

On Tuesday, January 9, 2018 at 9:24:03 AM UTC-8, Jeroen Belleman wrote:

I learned today that there are places where people live and
are exposed to dose rates of the order of 100uSv/h,
https://en.wikipedia.org/wiki/Ramsar,_Mazandaran

They could sell all of their radioactive limestone on ebay.

But then their town would fall into the molten lava at the
center of the Earth.

Lots of things are radio active.

The salt subistute (potassium cloride) is often radio active, and people
eat that.

It's always radioactive. there are no stable isotopes of potassium.

Wiki says that 39 and 41 are stable.

hmm, yeah other places agree, I wonder how I got that idea, I had the
impression that 39 and 41 were just much less radioactive.

K is about the hottest stuff commonly around. Two others are old red
(uranium colored) bricks, and thoriated Coleman lantern mantles.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

Bismuth (one of my favorite elements) is just barely radioactive.
~10^19 years according to wiki.

George H.


Europium is also very mildly radioactive--half of it is Eu 151, which
has a half life of (5 +- 10)E18 years, i.e.

Ten years or so ago, I needed to put down some europium films to make
fancy tunnel junctions, and I couldn't because the thin film folks at
Watson weren't allowed to use radioactive materials. :(
Click to expand...
And I thought it was only state institutions that had silly radioactivity
laws/ rules.

George H.
A one-gram evaporator target would emit one alpha particle on average in
a time

t = 1/(6.02e23 atoms/mol * 1g/ 151g/mol * ln(2) / (5e18 y * 3.16e7 s/y))

= 57175 seconds, i.e. about one every 16 hours.

Sigh.

Cheers

Phil Hobbs


--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com
Click to expand...
 
On Mon, 12 Feb 2018 20:26:02 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

On 02/12/2018 08:04 PM, etpm@whidbey.com wrote:
On Mon, 12 Feb 2018 17:30:41 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 02/09/2018 10:33 AM, Ralph Mowery wrote:
In article <c7f829cf-7b69-4e94-bd58-e4dfb920bc6f@googlegroups.com>,
billb@eskimo.com says...

On Tuesday, January 9, 2018 at 9:24:03 AM UTC-8, Jeroen Belleman wrote:

I learned today that there are places where people live and
are exposed to dose rates of the order of 100uSv/h,
https://en.wikipedia.org/wiki/Ramsar,_Mazandaran

They could sell all of their radioactive limestone on ebay.

But then their town would fall into the molten lava at the
center of the Earth.

Lots of things are radio active.

The salt subistute (potassium cloride) is often radio active, and people
eat that.



Always! Fortunately the body's homeostasis keeps the K ion
concentration reasonably constant.

Cheers

Phil Hobbs
Yes, the biological half life must also be considered when one is
exposed to radioactive compounds. I read a few good books on
radioactivity, radiation, and the biological consequences of exposure
to same before I had radioactive seeds implanted. I even used a nice
digital display geiger counter to monitor the decay over time. Not
very accurate considering I just held the counter against the same
approximate spot once a day. But I did emit more than the safe exposre
limit for about a month. So I had to keep the cats from sitting on my
lap for a while. My wife too. I missed my wife more than the cats.
Eric

Hopefully the plumbing recovered!

Cheers

Phil Hobbs
Click to expand...
Yeah, it did. For the most part. But from stage 4 to what they now
think is cured is pretty good. Required more than radiation but the
radiation part was at least interesting.
Eric
 
On 02/13/2018 12:20 PM, etpm@whidbey.com wrote:
On Mon, 12 Feb 2018 20:26:02 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 02/12/2018 08:04 PM, etpm@whidbey.com wrote:
On Mon, 12 Feb 2018 17:30:41 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 02/09/2018 10:33 AM, Ralph Mowery wrote:
In article <c7f829cf-7b69-4e94-bd58-e4dfb920bc6f@googlegroups.com>,
billb@eskimo.com says...

On Tuesday, January 9, 2018 at 9:24:03 AM UTC-8, Jeroen Belleman wrote:

I learned today that there are places where people live and
are exposed to dose rates of the order of 100uSv/h,
https://en.wikipedia.org/wiki/Ramsar,_Mazandaran

They could sell all of their radioactive limestone on ebay.

But then their town would fall into the molten lava at the
center of the Earth.

Lots of things are radio active.

The salt subistute (potassium cloride) is often radio active, and people
eat that.



Always! Fortunately the body's homeostasis keeps the K ion
concentration reasonably constant.

Cheers

Phil Hobbs
Yes, the biological half life must also be considered when one is
exposed to radioactive compounds. I read a few good books on
radioactivity, radiation, and the biological consequences of exposure
to same before I had radioactive seeds implanted. I even used a nice
digital display geiger counter to monitor the decay over time. Not
very accurate considering I just held the counter against the same
approximate spot once a day. But I did emit more than the safe exposre
limit for about a month. So I had to keep the cats from sitting on my
lap for a while. My wife too. I missed my wife more than the cats.
Eric

Hopefully the plumbing recovered!

Cheers

Phil Hobbs
Yeah, it did. For the most part. But from stage 4 to what they now
think is cured is pretty good. Required more than radiation but the
radiation part was at least interesting.
Eric
Click to expand...

Long may it wave. ;)

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com
 
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