Reply by Phil Hobbs ●February 13, 20182018-02-13
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
> 


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
Reply by ●February 13, 20182018-02-13
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
Reply by George Herold ●February 13, 20182018-02-13
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. :(

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
Reply by Phil Hobbs ●February 12, 20182018-02-12
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


-- 
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
Reply by ●February 12, 20182018-02-12
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
Reply by John Larkin ●February 12, 20182018-02-12
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


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
Reply by Phil Hobbs ●February 12, 20182018-02-12
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


-- 
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
Reply by Phil Hobbs ●February 12, 20182018-02-12
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

-- 
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
Reply by George Herold ●February 12, 20182018-02-12
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.
Reply by John Larkin ●February 11, 20182018-02-11
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