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RE: 'Dirty Bomb' Was Major New Year's Worry
Classified? Well that is an interesting word...it might
have meaning with some of us, but in DC I just
laugh.....However there is plenty on public record. Its
when we start talking about defeating a system that my
ears perk up.......Gerry Blackwood
On Thu, 08 Jan 2004 16:55:50 -0800, John R Johnson
wrote:
All
How
can Science and Technology by classified? All the
information is in libraries
and on web sites.
_________________John
R Johnson, Ph.D.*****President, IDIAS, Inc4535 West
9-Th
AveVancouver B. C.V6R 2E2(604)
222-9840idias@interchange.ubc.ca*****or most
morningsConsultant
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-----Original Message-----From:
owner-radsafe@list.vanderbilt.edu
[mailto:owner-radsafe@list.vanderbilt.edu]On Behalf
Of Raymond A
HooverSent: January 8, 2004 2:38 PMTo: Dimiter
Popoff;
radsafe@list.vanderbilt.eduSubject: Re: 'Dirty Bomb'
Was Major New
Year's Worry
Actually, I think you guys are bordering on
classified information
here. What the instrumentation could do was
classified when I was in
NEST.Dimiter Popoff <k.merritt@larc.nasa.gov>
wrote:
Having
both detectors will indeed allow separation of
neutrons
andgamma.Resolution of the scintillation detectors
is nowhere near
to what isneeded to make a qualitative assessment
of the gamma
source.It may be because I have been designing
various
top-performancehigh resolution spectroscopy devices
for quite some time
now I justcannot think of a scintillation based
device as of
something"highly sensitive". Which does not mean it
is not good
enough,it depends on what quantities they are after
and how much
noisethey get from various sources they are not
interested
in.Dimiter--------------------------------------------------------------------Dimiter
PopoffTransgalactic Instruments, Gourko Str. 25 b,
1000 Sofia,
Bulgariahttp://transgalactic.freeyellow.com> From:
"Morgan, Ben" > To: "'Dimiter Popoff'"
, radsafe@list.Vanderbilt.Edu> Subject: RE:
'Dirty Bomb' Was Major New Year's Worry> Date: Thu,
8 Jan 2004
11:11:42 -0500 > > Dimiter:> Here are the
description
and specifications for a device available> from
Thermo Electron.
www.thermo.com/rmp > Regards,> > Ben> >
ben.morgan@pgnmail.com> > The PM1401GN pocket-sized
instrument
is designed as a highly sensitive> measurement
device that may be
conveniently worn on a belt to provide> warning of
rising levels of
gamma and neutron radiation. These units> are
typically used to
search for, detect and locate radioactive
materials> in a variety of
situations. They also provide an excellent tool
for> extending
stationary monitoring systems to expand the
surveillance > or to
verify alarms of such systems and locate the
offendi! ng item(s).>
Compared to the smaller pager size devices, the
larger pocket-size >
PM1401GN offers enhanced sensitivity thereby
increasing the chance >
of detection. Another key feature provided is early
warning
capability> and audible annunciation. > >
Detectors> > The PM1401GN utilizes two separate
detectors, one
for gamma and another> for neutrons. A CsI(TL)
scintillation detector
senses gamma emitting radioactive> materials with
energies between
.06 and 3.0 MeV with a useful detection> range of
0.05 to 40 5Sv/h (5
to 40 5R/h). The neutron detector is a 3He> counter
tube sensitive to
neutrons between thermal and 14 MeV. > > Controls>
> A single push-button provides access to all the
necessary functions
of> this user-friendly design. A second button
lights the display for
use > in dark ambient conditions. These detection
devices include an
integral&g! t; vibrator which may be set by the
user to activate any
time an alarm setpoint> is exceeded. > > PM1401GN
Specifications> Gamma Detector: CsI (Tl)
scintillator.>
Measurement Range: 0.05 to 40 5Sv/h (5 - 4000
5R/h). Equivalent dose rate
137Cs.> Energy Range: 0.06 to 3.0 MeV.> > Neutron
Detector: > 3He Counter tube with mixture of 3He (8
atmospheres) and
argon (2 atmospheres)> Energy Range: Thermal to 14
MeV.>
> General> Measurement Time: 0.25 seconds.>
Detection
Sources: Meets ITRAP (Illicit Trafficking Radiation
Detection Assessment
Program).> Alarm Types: Audio tone and/or
vibration.> Power
Requirements: One AA size battery. Life expectancy
is approximately 600
hours.> PC Communications: IR-interface.> Data
Collection: 900
data points stored in non-volatile memory.>
Operating Temperature:
-300 to +500 C (-220 to +1220 F).> Water
Tightness:! IP67 (optional
water resistance to 20 meters)> Drop Test: 0.7 m
(27.5 inches) onto
concrete surface.> Dimensions: 97 x 57 x 32 mm (3.8
x 2.2 x 1.2
inches). Not including clip.> Weight: 365 g (12.9
oz). Including
battery.> > -----Original Message-----> From:
Dimiter
Popoff [mailto:k.merritt@larc.nasa.gov] > Sent:
Thursday, January 08,
2004 10:05 AM> To: radsafe@list.vanderbilt.edu>
Subject: Re:
'Dirty Bomb' Was Major New Year's Worry> > > Do you
actually know what their instrumentation is or is
this just another summary
of the kind "it is OK because it just has > >
Dimiter>
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