[ RadSafe ] Chris Busby

[John R Johnson]

Bill

Best regards from BBC.

X-rays vs electrons is what we were addressing at CRNL in

INDUCTION OF MAMMARY TUMOURS IN RATS BY X-RAYS AND TRITIUM BETA-RAYS

D.K. Myers, N.J. Gragtmans, J. R. Johnson, L.D. Johnson, and A.R. Jones

Published in the proceedings of an international symposium on The Effects of 
Low-Level Radiation with Special Regard to Stochastic and Non-Stochastic 
Effects, jointly organized by the International Atomic Energy Agency and the 
World Health Organization, IAEA-SM-266/12P (1983) 653.





John
***************
John R Johnson, PhD
CEO, IDIAS, Inc.
4535 West 9th Ave
Vancouver, B. C.
V6R 2E2, Canada
idias at interchange.ubc.ca


----- Original Message ----- 
From: "Bill Prestwich" <prestwic at mcmaster.ca>
To: "'The International Radiation Protection (Health Physics) Mailing List'" 
<radsafe at agni.phys.iit.edu>
Sent: Thursday, April 21, 2011 7:54 AM
Subject: Re: [ RadSafe ] Chris Busby


> This argument is not convincing for two reasons. Studies in which tritium
> has been intentionally introduced into hydrogen positions in DNA have 
> shown
> that such substitutions are not significant. The long range damage of even
> this very low energy beta particle results in non-localized damage.
> Radionuclide binding to DNA is simply not relevant. Secondly, the
> consequence of misrepair leads to a great deal of the subsequent 
> deleterious
> consequences. Hence the lack of repair in not necessarily a bad thing. It
> may indeed provoke the desired response of either cell apoptosis or loss 
> of
> proliferative capability. The average time between 90Sr and 90Y decays is
> 40.5 years, so application of the concept in this case is really rather
> inapt.
> Bill
>
> -----Original Message-----
> From: radsafe-bounces at agni.phys.iit.edu
> [mailto:radsafe-bounces at agni.phys.iit.edu] On Behalf Of Busby Chris
> Sent: Wednesday, April 20, 2011 1:44 PM
> To: The International Radiation Protection (Health Physics) Mailing List;
> radsafe at agni.phys.iit.edu
> Subject: Re: [ RadSafe ] Chris Busby
>
> Hurrah!
> At last a scientific dialogue.
> The Second Event Theory is simple.
> Some internal radionuclides that bind to DNA have sequential decays
> In certain circumstances, there are also external dose fractionations with
> two or more tracks across the target in 12 hours. e.g. CT scans of road
> accident victims.
> Why 12 hours?
> This is the cell cycle from G(0) to M.
> At the end of this cycle is the XTP. After this no repair is possible. The
> cell sensitivity varies enormously and is very high at the end of G(0)M.
> Therefore is a cell is inducted into G(0) M cycle from quiescence by a 
> first
> "hit" and then hit again after the repair, no further repair is possible 
> and
> a fixed mutation is inevitable.
> There is already evidence from cell cultuires that support this.
> Certain sequential decaying internal nuclides are unsafe, the worst is
> Sr90/Y90.
> It is all explained in Wings of Death 1995 and some later papers.
> There is plenty of evidence that Sr90 is very serious mutagen not modelled
> by ICRP dose coefficients.
> But I started with the Chernobyl infants and that is what I would like to
> focus on.
> Sincerely
> Chris
>
>
>
>
> -----Original Message-----
> From: radsafe-bounces at agni.phys.iit.edu on behalf of John R Johnson
> Sent: Wed 20/04/2011 16:09
> To: radsafe at agni.phys.iit.edu
> Subject: [ RadSafe ] Chris Busby
>
> Radsafers
>
>
>
> I don't understand all this criticism of Chris Busby. I used google to 
> find
> http://en.wikipedia.org/wiki/Christopher_Busby  to looked at his 
> background
> and he looks like a scientist
>
> we should encourage discussion with. I am an "internal dosimetrist" and 
> one
> of the items given in the web site I would like to hear more about is the
> "Second Event Theory" which
>
> distinguishes between hazards of external and internal radiation.
>
>
>
> Chris is no relation of Bruce Busby from Seattle as far as I know
>
>
>
> John
>
> ***************
> John R Johnson, PhD
> CEO, IDIAS, Inc.
> 4535 West 9th Ave
> Vancouver, B. C.
> V6R 2E2, Canada
> idias at interchange.ubc.ca
>
>
>
>
>
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