Re: secondary x-rays from ultra-sound:proved to exist

[Jim Vandergrift <jfvande@yahoo.com>]

--- Jim Vandergrift <jfvande@yahoo.com> wrote:
> This seems energetically impossible to me. The only
> "x-rays" possible
> are characteristic x-rays.  In order for them to be
> classified as
> "ionizing" radiation they must be 13.6 eV or
> greater.  The only
> electrons available to be effected by mechanical
> collisions as with
> ultrasound or thermal processes are the "valence" or
> outer electrons. 
> It seems unlikely that these electrons (in
> biological systems) will
> have binding energies of 13.6 eV.  To associate
> ultrasound and x-rays
> simply because of their associated "wave" properties
> is to demonstrate
> a fundamental ignorance of both processes. 
> 
> --- Rachid Zitouni <azittouni@yahoo.com> wrote:
> > 
> > 
> > --- LAM HOI CHING <lamhc@hkusua.hku.hk> wrote:
> > 
> > > Ultansonic wave is only a kind of mechanical
> > > effect,it is a kind of
> > > macroscopic phenomenon in the material, it
> affects
> > > only the mechanical
> > > vibration of atom, but  not to the atomic
> > structure
> > > change like the atomic
> > > orbital,whereas x-rays are due to internal
> > > transition of atom or molecules,
> > > in fact from electrons of the atom, these two
> > > effects are not in the same
> > > category.
> > > 	But you can discuss ionizing damage from x-ray
> > > (doses)
> > > or you can still discuss the harmful effect of
> > > ultrasound. The two types of
> > > interactions (by ultra-sound and x-ray) are
> > totally
> > > different.
> > > 
> > > 
> > 
> > Few years ago, I would have agreed with you. Yes,
> > ultrasound acts on
> > the bulk of the matter, at the macroscopic level
> and
> > X-rays at the
> > electronic level.
> > Ultrasonic waves are not supposed to ionize
> matter.
> > 
> > BUT:
> > Very low Enegy X-rays have been detected following
> > diagnostic
> > ultrasound. I lost track of the paper which was
> > published on this
> > subject.This phenomenon has been proved to exist.
> I
> > haven't done the
> > experiment myself, but I suppose the excitation of
> > matter by ultrasound
> > at the molecular level may, under certain
> > circumstances (which are to
> > be determined), give rise to very low energy X-ray
> 
> > 
> > By the way, I haven't referred to any biological
> > effect related to
> > these low-energy X-rays. In fact, the dose in this
> > case is meaningless.
> > 
> > Thanks for the reply and keep digging if the
> subject
> > is of interest to
> > you.
> > 
> > Abderrachid ZITOUNI, health Physicist
> > 
> > azittouni@yahoo.com
> >
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> 
> 
> 
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