[ RadSafe ] Oncology 'laser', questions

Thu Nov 23 14:15:04 CST 2006

Franz

Good questions. I look forward to seeing the answers.

John

-----Original Message-----
From: Franz Schönhofer [mailto:franz.schoenhofer at chello.at]
Sent: November 23, 2006 11:57 AM
To: 'Wesley'; 'John R Johnson'; radsafe at radlab.nl
Subject: AW: [ RadSafe ] Oncology 'laser', questions

RADSAFErs,

It took a long time at RADSAFE to clarify the difference between Ra and Rn,
to clarify that Ra-226 decays to Rn-222 and that this will not build up to
infinite pressure but to the equilibrium according to its short half-life. I
can confirm the contribution of Wes by facts: It is known, that explosions
of glass contained radium sources occurred partly due to He-build-up. Some
explosions were attributed to formation of hydrogen and oxygen due to
radiolysis of crystal water, but I am very sceptic about that - chemists (I
am one) dry their salts extremely carefully because of yield determination
and anyway how should this gas mixture have been ignited? I know for
sure,that flame-sealed glass containers with sources of radium (in the
Ci-range) were carefully opened at the former Institute of Radium Research
to release the pressure of He-gas formed in the meantime.

But much more than these topics I am bothered by other questions.

Can somebody tell me why light is emitted by simply cooling down a gas?
Never heard about this, but would appriciate any information to improve my
knowledge. Secondly I would like to know, how light emitted by any process
would - obviously without any intermediate treatment! - be suddenly
transformed into a laser? I am a laser-layman, so please "enlighten" me.

Best regards,

Franz

Franz Schoenhofer
PhD, MR iR
Habicherg. 31/7
A-1160 Vienna
AUSTRIA
phone -43-0699-1168-1319

> -----Ursprüngliche Nachricht-----
> Von: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] Im
> Auftrag von Wesley
> Gesendet: Donnerstag, 23. November 2006 17:12
> An: 'John R Johnson'; radsafe at radlab.nl
> Betreff: RE: [ RadSafe ] Oncology 'laser'
>
> All,
> And, speaking of gas pressure building up in a sealed container from Ra-
> 226
> and Rn-222, do not forget that alpha particles find two electrons each and
> become helium gas. The He gas pressure increases indefinitely at a rate
> governed by the ~1620 year Ra-226 half life.
>
> Gobble, gobble,
> Wes
>
> [New email address:  WesVanPelt at verizon.net]
> Best regards,
> Wes
> Wesley R. Van Pelt, PhD, CIH, CHP
> Wesley R. Van Pelt Associates, Inc.
>
> -----Original Message-----
> From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On
> Behalf
> Of John R Johnson
> Sent: Thursday, November 23, 2006 9:50 AM
> To: Flanigan, Floyd; edmond0033; radsafe at radlab.nl
> Subject: RE: [ RadSafe ] Oncology 'laser'
>
> Floyd
>
> Some clarification is required. The amount of Rn-222 given off depends on
> the amount of Ra-226 present and the amount of Rn-222 that builds up in
> the
> chamber reaches a maximum that is governed by its ~3.8 day halflife.
>
> John
>  _________________
> John R Johnson, Ph.D.
> *****
> President, IDIAS, Inc
> 4535 West 9-Th Ave
> Vancouver B. C.
> V6R 2E2
> (604) 222-9840
> idias at interchange.ubc.ca
> *****
>
> -----Original Message-----
> From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl]On
> Behalf Of Flanigan, Floyd
> Sent: November 22, 2006 10:06 PM
> To: edmond0033; radsafe at radlab.nl
> Subject: RE: [ RadSafe ] Oncology 'laser'
>
>
> Radium 226 gives off Radon at a constant of .0001ml/day. This would be
> in a sealed chamber with a mirrored interior surface and a fiber-optic
> cable affixed to the only opening. The entire chamber would be cooled to
> -195C and the Radon 222 emitted from the Radium 226 in the chamber would
> be the source. The longer the Radium remained sealed in the chamber, the
> more Radon would build up in the chamber, and, theoretically, the
> stronger the source light would become. There would have to be a
> throttle of sorts, controlling aperture size on the laser pen to control
> the beam.
>
> Floyd W. Flanigan B.S.Nuc.H.P.
>
>
> -----Original Message-----
> From: edmond0033 [mailto:edmond0033 at comcast.net]
> Sent: Wednesday, November 22, 2006 12:18 PM
> To: Flanigan, Floyd; radsafe at radlab.nl
> Subject: Re: [ RadSafe ] Oncology 'laser'
>
> Do you mean Radium-226 or Radon-222?
>
> Ed Baratta
> edmond0033 at comcast.net
> ----- Original Message -----
> From: "Flanigan, Floyd" <Floyd.Flanigan at nmcco.com>
> To: <radsafe at radlab.nl>
> Sent: Wednesday, November 22, 2006 6:20 AM
> Subject: [ RadSafe ] Oncology 'laser'
>
>
> Okay ... Here's the rub:
>
>
>
> When Radon 226 is cooled to -195C, it gives off an orange-red light. If
> said light was captured and channeled through a fiber-optic cable to a
> light pen, and one incised a patient to expose a cancerous tumor, could
> one affect said tumor with a Beta burn with the emissions from the light
> 'laser' pen? And if so, would this be an effective means of eradicating
> said tumor?
>
>
>
> How's that for a 'what if' ?
>
>
>
> Floyd W. Flanigan B.S.Nuc.H.P.
>
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