ALPHA AND BETA-GAMMA HAND & SHOE MONITOR WITH DIGITAL 
DYNAMIC BACKGROUND SUBTRACT

Model # HSM-10GP - Sealed Detectors - No Gas Flow

FEATURES:

* READS ALPHA AND BETA-GAMMA SEPARATELY 
  AND SIMULTANEOUSLY

* AUTOMATICALLY ADJUSTS FOR CHANGING BACKGROUND 
  LEVELS

* ALL MODULAR INTEGRATED CIRCUIT DIGITAL CIRCUITRY

* TILTED READOUT PANEL AT EYE LEVEL FOR EASY VIEWING

* PROJECTOR WARNING SYSTEM

* LOW LEVEL ALARM, HIGH BACKGROUND ALARM AND
  CONTAMINATION ALARM

* AUDIBLE WARNING IF HANDS OR SHOES ARE MOVED OFF 
  OF DETECTION AREA BEFORE END OF COUNTING TIME

* INDIVIDUAL ALPHA AND BETA-GAMMA VISUAL ALARM
  INDICATORS

* SHIELDED $^{1}$ EASILY DECONTAMINATED SEALED DETECTORS

* FILTERING AND CABLING DESIGN MINIMIZES 
  ELECTROMAGNETIC 
  INTERFERENCE FROM EXTERNAL SOURCES

GENERAL DESCRIPTION: The HSM-10GP monitors both Alpha 
and Beta-Gamma in each channel. There are three 
channels of detection - left foot, right foot, and 
hands (* see specs for other options). Each channel has 
separate alarm level set switches for alpha and for 
beta-gamma radiation. Background is monitored 
continuously while the system is unoccupied. Background 
subtraction uses the most recent beta-gamma background 
count. Time for the monitoring count is preset on a 
versatile digital timer with choices from 1 to 99 
seconds in one second intervals. This preset time is 
also the background update time. The beta-gamma alarm 
switch for each channel sets the count above background 
needed within the preset time period to excite an 
alarm. Alpha background is low (typically << 10 cpm) 
and may be neglected or counted by the HSM-10GP and 
added to give best preset alpha count.
 <Graphic file:hsm-10g-b03.ps>

 
<Graphic file:hsm-10g-a02.ps>

 
Figure 1: HSM-10GP (Top), 
HSM-10GP Panel (Bottom)
 

Operation is digital. Indicators include LED's and 
warning projection with warnings projected onto a front 
panel screen in a large and very effective display. A 
five digit plus overflow LED display can be switched to 
each channel for alpha, beta, or background displays 
for aid in calibration. The display and controls are 
behind a locked cabinet door. Counting time for all 
channels is preset on a digital timer with choice of 1 
to 99 seconds in 1 second increments. High sensitivity 
is achieved by using spring loaded hand detectors, 
large, minimum thickness detector windows and maximum 
transmission protection screens.

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


$Revision: 1.1 $

ALPHA AND BETA-GAMMA HAND & SHOE MONITOR WITH DIGITAL 
DYNAMIC BACKGROUND SUBTRACT

Model # HSM-10GP- Sealed Detectors - No Gas Flow

SPECIFICATIONS:

*Options of : left hand, right hand, both feet or left 
foot, right foot, both hands.

Hand Detectors: 2" dia. x 1/2" deep. 4 Tubes per Hand (8 Total).

Shoe Detectors: 2" dia. x 1/2" deep. 3 Tubes per Foot (6 Total).

Detector Construction: Thin Window, Sealed Proportional 
Detectors for easy access and decontamination. 
Shielding for background reduction. <2.2 mg/cm$^{2}$ Mica 
detector windows with protection screen 73% open area.

Shielding: $\geq $ 2 pi shielding about detectors - 0.7" lead. 
(Optional) Other shield thinkness also available.

Channels: Left shoe, right shoe, hands or left hand, 
right hand, both feet or left foot, right foot, both hands.

Utility Scaler: 0 to 99,999 plus overflow with LED 
display. Can switch to left shoe alpha; left shoe beta; 
right shoe alpha; right shoe beta; hands alpha; hands beta.

Calibration Factors: Each Channel has easy enter a 
Calibration Factor so the HSM can readout in Raw Counts 
(calfactor=1) or Bq/100cm$^{\textrm{2}}$ or other units of the user's choosing.

Channel Counting Time: Selectable from 1 second to 99 
seconds in 1 second increments.

Background Update Interval: Background updates 
automatically whenever unit is not occupied. Background 
update interval same as channel counting time.

Alarms: Background - Sonalert plus front panel light 
indicators. Adjustable in 10 steps - 100 counts to 
1,000 counts.
Low Level Alarm - (indicates malfunction) - front panel 
light indicator (factory set).
Channel Alarms - Sonalert plus front panel light 
indicators. Selectable in 1 count increments: Alpha - 0 
to 99 counts; Beta-Gamma - 0 to 999 counts.
Check Incomplete - Sonalert plus projector warning.

Projector Warning System: Front panel screen 3-1/2" x 2-3/4"
 with display of following messages - only one message 
displayed at one time.
Contamination (location of contamination channels and 
whether alpha or beta contamination also displayed).
Check OK
Ready for Use
Counter in Operation
Check Incomplete - Reset and Repeat

Front Panel Indicators: Message Projection, High 
Background Alarm Light, Low Level Alarm Light, Power-On Light

Use Count Register: (Audit instrument use) - 0 to 99,999 (Optional)

Power Source: 115 VAC, 60 hz (200-240 V, 50-60 hz optional)

Dimensions: Cabinet - approximately 67" high x 27" wide x 24"
 deep (170 x 70 x 60 cm)

Shipping Weight: 650 lbs. (295 kilos) Includes Optional shielding.

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


$Revision: 1.1 $