PIPE MONITOR

Model # PDP-2L

FEATURES:

* SENSITIVE - TO < 1 Bq/cm$^{\textrm{2}}$

* FAST - TO OVER 100 FT./MIN.

* PORTABLE

* READS ALPHA & BETA-GAMMA SEPARATELY

* OPTIONALLY ALPHA & BETA-GAMMA SEPARATELY & SIMULTANEOUSLY

APPLICATION: To monitor inside surfaces of pipe 1/2" IPS 
(or larger) schedule 40, 60, or 80 at speeds of more 
than 1 foot per second.
 
DESCRIPTION: The system consists of a gas flow detector 
sized to pass through a 1/2" IPS Pipe (0.625 id) plus a 
24 foot cable / tubing assembly to a small connection 
box to accept flow gas from a source which can be 
immediately adjacent or at a distance. 36 feet of 
additional tubing is supplied.<Graphic file:pdp-1-probe-img.ps>

 <Graphic file:pdp-prs-img.ps>

PDP-2L Probes (Top), PRS-5 (Bottom)
 

The detector can accept bias supply from the same 
distance and deliver a signal to, a PRS-5 
Scaler-Ratemeter Pulse Height Analyzer. If desired, 
longer coax cables can be inserted between connection 
box and PRS-5 electronics. 

The PDP-2L Detector has a 12" long sensitive volume with 
windows approximating 1/3 of the surface. These windows 
are of aluminized mylar with total thickness less than .0002"
 and are transparent to all common alphas and gammas 
and to all common betas with energies above 20 Key. A 
screw at the end of the detector opposite to the signal 
end is available for attachment to a pulling device. 

Alpha or Beta-Gamma can be counted separately by 
setting the toggle switch in the PRS-5 readout to the 
desired pulse height window. To read Alpha and 
Beta-Gamma separately and simultaneously: output of the 
detector could be sent to two PRS-5's at the end of the 
cable: one set in the alpha window of choice, the other 
on the desired beta/gamma window.

SPECIFICATIONS:

Proportional Gas: Flow P10. 66% open to Alphas.

Overall length: 14" 66% open to Betas.

Sensitive length: 12" Maximum diameter 0.6".

Lower limit of detection: (95% confidence level) at 1 foot/second:
1000 dpm Alpha.
4000 dpm Beta.

Background: (Alpha): Typically 1 cpm unshielded.
(Beta/Gamma): Typically 100 cpm unshielded.

Cable: Single conductor shielded MHV terminated - 24 feet.

Tubing: (for P10 gas) 36 feet.

Electronics: Model PRS-5 - 3 channel switch selectable 
- Scaler/Ratemeter/SCA. Has output for alarm.

T$_{\textrm{A}}$                                   TECHNICAL ASSOCIATES                                   
------------------------------------------------------------------------------------------
  7051 ETON AVENUE * CANOGA PARK, CA 91303 TELEPHONE (818) 883-7043 * FAX(818) 883-6103   
                                 www.tech-associates.com                                  


$Revision: 1.1 $