[ RadSafe ] Chris Busby

Thu Apr 21 13:22:39 CDT 2011

Your ideas arent very clever.
The half life of Sr90 is not relevant as it delivers the FIRST hit. It is the half life of Y90 which is critical. Then you work out the probability. The half life of the second nuclide is the key, not the first. Think about it a bit harder.
There are many studies showing Sr90 to be much more genotoxic than Cs-137, same half life roughly, and one which compares Sr90 and Sr89. Showes Sr90 more genotoxic in saccharomyces for certain loci. 
Sincerely
Chris

-----Original Message-----
From: radsafe-bounces at agni.phys.iit.edu on behalf of John R Johnson
Sent: Thu 21/04/2011 17:00
To: The International Radiation Protection (Health Physics) Mailing	List; 'The International Radiation Protection (Health Physics) Mailing	List'
Subject: Re: [ RadSafe ] Chris Busby

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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