Date: Fri, 12 Sep 2003 12:08:02 -0400

Author: Wayne Strange

Subject: Re: 5D40.30 - radioactive discharge

Post:

The americium source will last a lifetime. The half life of Po 210
is only 138 days. Wayne


>Tappers,
>
>I was showing my radioactive camera lens to some faculty this week when
>one of them told me about another radioactive device for use with cameras.
>I turns out that most good camera stores sell a lens brush that has a
>small polonium 210 source in it. Cost is around $20. So, I got one and
>tried it out in place of my high priced licensed americium source for
>discharging a negatively charged electroscope or charged parallel plates.
>Worked just fine at distances of 5 cm or less. For those of you wishing
>to do or develop this demo it would be a cheap and hassle free
>alternative.
>
>Dale Stille
>U of Iowa

--
Wayne P. Strange
Physics Department
Trinity College
300 Summit Street
Hartford Ct. 06106

Tel (860)297-2359
Fax (860)987-6239
From dstille@newton.physics.uiowa.edu Fri Sep 12 10:20:17 2003
Date: Fri, 12 Sep 2003 12:03:05 -0500 (CDT)
From: Dale Stille
X-X-Sender: dstille@newton
To: tap-l@listproc.appstate.edu
Subject: Re: 5D40.30 - radioactive discharge
In-Reply-To:
Message-ID:
References: <8DB9C75E-E201-11D7-B96B-000393B080FA@valpo.edu>


MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-MailScanner-Information: Please contact the Helpdesk @ 6266 for more information
X-007-MailScanner: Found to be clean
X-MailScanner-SpamCheck: not spam, SpamAssassin (score=-31.9, required 7,
EMAIL_ATTRIBUTION -6.50, IN_REP_TO -3.30, QUOTED_EMAIL_TEXT -3.20,
REFERENCES -6.60, REPLY_WITH_QUOTES -6.50, USER_AGENT_PINE -5.80)
Reply-To: tap-l@listproc.appstate.edu
Sender: owner-tap-l@listproc.appstate.edu
X-Listprocessor-Version: 8.2.10/991025/16:55 -- ListProc(tm) by CREN


Wayne,

Ah, but they have that figured out. The source is dated and removable
from the brush so that you can send it in and get a replacement source
when the alpha production gets too low. And since these are small enough
that you don't need a license and unless you are living in a
over-restrictive state such as Nebraska or Colorado, this may be a nice
way to go for this demo for many people.

Dale

On Fri, 12 Sep 2003, Wayne Strange wrote:

> The americium source will last a lifetime. The half life of Po 210
> is only 138 days. Wayne
>
>
> >Tappers,
> >
> >I was showing my radioactive camera lens to some faculty this week when
> >one of them told me about another radioactive device for use with cameras.
> >I turns out that most good camera stores sell a lens brush that has a
> >small polonium 210 source in it. Cost is around $20. So, I got one and
> >tried it out in place of my high priced licensed americium source for
> >discharging a negatively charged electroscope or charged parallel plates.
> >Worked just fine at distances of 5 cm or less. For those of you wishing
> >to do or develop this demo it would be a cheap and hassle free
> >alternative.
> >
> >Dale Stille
> >U of Iowa
>
> --
> Wayne P. Strange
> Physics Department
> Trinity College
> 300 Summit Street
> Hartford Ct. 06106
>
> Tel (860)297-2359
> Fax (860)987-6239
>
>
From dwilley+@pitt.edu Fri Sep 12 10:39:28 2003
Date: Fri, 12 Sep 2003 13:22:13 -0400
From: David Willey
Subject: linear expansion
To: tap-l@listproc.appstate.edu
Message-id: <3F6200C5.7040307@pitt.edu>
Organization: UPJ
MIME-version: 1.0
Content-type: text/plain; charset=us-ascii; format=flowed
Content-transfer-encoding: 7bit
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.4)
Gecko/20030624 Netscape/7.1 (ax)
X-Accept-Language: en-us, en
X-MailScanner-Information: Please contact the Helpdesk @ 6266 for more information
X-007-MailScanner: Found to be clean
X-MailScanner-SpamCheck: not spam, SpamAssassin (score=-5.8, required 7,
USER_AGENT_MOZILLA_UA -5.80)
Reply-To: tap-l@listproc.appstate.edu
Sender: owner-tap-l@listproc.appstate.edu
X-Listprocessor-Version: 8.2.10/991025/16:55 -- ListProc(tm) by CREN

Hi Tappers,
I wrote in a couple of days ago about problems I'm having with PASCO's
linear expansion apparatus. As yet, no one has picked up on this thread.
Am I to assume no one else does this experiment, or is it that everyone
else gets great results?
cheers,
dai
From sampere@physics.syr.edu Fri Sep 12 10:55:02 2003
Message-ID: <3F62046F.6090104@physics.syr.edu>
Date: Fri, 12 Sep 2003 13:37:51 -0400
From: sampere
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax)
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: tap-l@listproc.appstate.edu
Subject: Re: linear expansion
References: <3F6200C5.7040307@pitt.edu>
In-Reply-To: <3F6200C5.7040307@pitt.edu>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
X-MailScanner-Information: Please contact the Helpdesk @ 6266 for more information
X-007-MailScanner: Found to be clean
X-MailScanner-SpamCheck: not spam, SpamAssassin (score=-31.9, required 7,
EMAIL_ATTRIBUTION -6.50, IN_REP_TO -3.30, QUOTED_EMAIL_TEXT -3.20,
REFERENCES -6.60, REPLY_WITH_QUOTES -6.50,
USER_AGENT_MOZILLA_UA -5.80)
Reply-To: tap-l@listproc.appstate.edu
Sender: owner-tap-l@listproc.appstate.edu
X-Listprocessor-Version: 8.2.10/991025/16:55 -- ListProc(tm) by CREN

I don't have it, sorry.

Sam

David Willey wrote:

> Hi Tappers,
> I wrote in a couple of days ago about problems I'm having with PASCO's
> linear expansion apparatus. As yet, no one has picked up on this
> thread. Am I to assume no one else does this experiment, or is it that
> everyone else gets great results?
> cheers,
> dai

From cbettis@unlserve.unl.edu Fri Sep 12 10:57:12 2003
Message-ID: <005501c37954$c47806c0$96245d81@lecturedemo>
From: "Cliff Bettis"
To:
References: <8DB9C75E-E201-11D7-B96B-000393B080FA@valpo.edu>
Subject: Re: 5D40.30 - radioactive discharge
Date: Fri, 12 Sep 2003 12:38:58 -0500
MIME-Version: 1.0
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.2800.1158
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165
X-MailScanner-Information: Please contact the Helpdesk @ 6266 for more information
X-007-MailScanner: Found to be clean
X-MailScanner-SpamCheck: not spam, SpamAssassin (score=-10.4, required 7,
QUOTED_EMAIL_TEXT -3.20, QUOTE_TWICE_1 -0.60, REFERENCES -6.60)
Reply-To: tap-l@listproc.appstate.edu
Sender: owner-tap-l@listproc.appstate.edu
X-Listprocessor-Version: 8.2.10/991025/16:55 -- ListProc(tm) by CREN

Dale,

We may be over regulated but at least the only people walking around campus
looking like mutants are football players ;-) Oh yeah, we also have a lot of
Penn State folks walking around campus today; they don't look strange, just
bewildered. I think they're hoping someone will be mean to them.

Cliff (who irradiated table salt with a 500 Curie gamma source and wowed
students when the salt glowed upon heating. I had kids coming around a week
later thanking me for the show!)


----- Original Message -----
From: "Dale Stille"
To:
Sent: Friday, September 12, 2003 12:03 PM
Subject: Re: 5D40.30 - radioactive discharge


>
> Wayne,
>
> Ah, but they have that figured out. The source is dated and removable
> from the brush so that you can send it in and get a replacement source
> when the alpha production gets too low. And since these are small enough
> that you don't need a license and unless you are living in a
> over-restrictive state such as Nebraska or Colorado, this may be a nice
> way to go for this demo for many people.
>
> Dale
>
> On Fri, 12 Sep 2003, Wayne Strange wrote:
>
> > The americium source will last a lifetime. The half life of Po 210
> > is only 138 days. Wayne
> >
> >
> > >Tappers,
> > >
> > >I was showing my radioactive camera lens to some faculty this week when
> > >one of them told me about another radioactive device for use with
cameras.
> > >I turns out that most good camera stores sell a lens brush that has a
> > >small polonium 210 source in it. Cost is around $20. So, I got one and
> > >tried it out in place of my high priced licensed americium source for
> > >discharging a negatively charged electroscope or charged parallel
plates.
> > >Worked just fine at distances of 5 cm or less. For those of you
wishing
> > >to do or develop this demo it would be a cheap and hassle free
> > >alternative.
> > >
> > >Dale Stille
> > >U of Iowa
> >
> > --
> > Wayne P. Strange
> > Physics Department
> > Trinity College
> > 300 Summit Street
> > Hartford Ct. 06106
> >
> > Tel (860)297-2359
> > Fax (860)987-6239
> >
> >
From odonnt@CELINA.K12.OH.US Fri Sep 12 11:16:42 2003
From: "Tim O'Donnell"
Organization: Celina City Schools
To: tap-l@listproc.appstate.edu
Date: Fri, 12 Sep 2003 14:06:00 -0500
MIME-Version: 1.0
Content-type: text/plain; charset=US-ASCII
Content-transfer-encoding: 7BIT
Subject: Re: linear expansion
Priority: normal
In-reply-to: <3F62046F.6090104@physics.syr.edu>
References: <3F6200C5.7040307@pitt.edu>
X-mailer: Pegasus Mail for Windows (v3.12b)
Message-ID: <63695D90569@CELINA.K12.OH.US>
X-Spam-Processed: mail.noacsc.org, Fri, 12 Sep 2003 13:58:31 -0400
(not processed: message from valid local sender)
X-MDRemoteIP: 10.52.1.5
X-Return-Path: odonnt@CELINA.K12.OH.US
X-MDaemon-Deliver-To: tap-l@listproc.appstate.edu
X-MailScanner-Information: Please contact the Helpdesk @ 6266 for more information
X-007-MailScanner: Found to be clean
X-MailScanner-SpamCheck: not spam, SpamAssassin (score=-9.9, required 7,
IN_REP_TO -3.30, REFERENCES -6.60)
Reply-To: tap-l@listproc.appstate.edu
Sender: owner-tap-l@listproc.appstate.edu
X-Listprocessor-Version: 8.2.10/991025/16:55 -- ListProc(tm) by CREN

I do this lab, but I don't use PASCO equipment.
My results are in the 10 to 15% range.

Tim O'Donnell
Celina High School
odonnt@celina.k12.oh.us
From dwilley+@pitt.edu Fri Sep 12 11:28:40 2003
Date: Fri, 12 Sep 2003 14:11:18 -0400
From: David Willey
Subject: Re: Linear thermal expansion
In-reply-to: <3F5E0B3D.6030706@pitt.edu>
To: tap-l@listproc.appstate.edu
Message-id: <3F620C46.3060201@pitt.edu>
Organization: UPJ
MIME-version: 1.0
Content-type: text/plain; charset=ISO-8859-1; format=flowed
Content-transfer-encoding: 7bit
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.4)
Gecko/20030624 Netscape/7.1 (ax)
X-Accept-Language: en-us, en
References: <003201c376e8$d90cf0a0$651378a3@depauw.edu>

<3F5E0B3D.6030706@pitt.edu>
X-MailScanner-Information: Please contact the Helpdesk @ 6266 for more information
X-007-MailScanner: Found to be clean
X-MailScanner-SpamCheck: not spam, SpamAssassin (score=-31.9, required 7,
EMAIL_ATTRIBUTION -6.50, IN_REP_TO -3.30, QUOTED_EMAIL_TEXT -3.20,
REFERENCES -6.60, REPLY_WITH_QUOTES -6.50,
USER_AGENT_MOZILLA_UA -5.80)
Reply-To: tap-l@listproc.appstate.edu
Sender: owner-tap-l@listproc.appstate.edu
X-Listprocessor-Version: 8.2.10/991025/16:55 -- ListProc(tm) by CREN

I'm reposting this as apparently it did not go through the first time,
ain't computers wonderful? ;-)
cheers,
David

David Willey wrote:

> Hi all,
> I've been using (or at least, trying to use) the PASCO thermal
> expansion apparatus for several terms and have never got consistently
> good results. It seems like a simple experiment, with fairly low
> uncertainties, a few percent at most, and yet even my best groups will
> at times have 10 to 15 percent errors. The same happens when I do it
> myself, and I'm pretty sure I'm following the instructions to the
> letter. The only things to measure are the sample's original length,
> room temperature, the temperature of steam and the increase in the
> sample's length, each of which I (erroneously) thought could be
> measured easily and accurately. What is the experience of other users?
> Is there some "trick" to making this apparatus yield good numbers?
> I've tried insulating just the center of the tube, as directed by
> PASCO, I've tried insulating the entire tube and I've tried with no
> insulation, none of which seems to make much difference. Any help you
> are able to offer will be much appreciated,
> cheers,
> David
>
From dimarco@physics.montana.edu Fri Sep 12 11:39:08 2003

Back