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DUAL CHAMBERS
READ BOTH
DETECTORS AT THE SAME TIME
BUILT IN
SHIELD
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The
HPI model 1075 Survey Meter is a dual channel instrument designed
to measure penetrating and nonpenetrating radiation fields simultaneously.
The detectors are back to back ionization chambers with different
wall thicknesses built into a single detector unit.
Specifications
Mechanical
 External
controls: Range switch with positions off, zero, 200, 20, and 2
rad/h, two zero controls, and a momentary light switch.
Size: 7"
H, 5 1/4" W, 12"
Weight: 5.5
lb.
Readout:
Two 3 ½ digit LCD with ½" digits with battery
check
Case: Black
anodized aluminum sealed with gaskets.
Detector
Type:
Two air equivalent parallel plate ionization chambers. Chambers
are guarded and unsealed.
Volume: 300cc
(each)
Wall thickness:
chamber: 7 mg/cmE2 chamber: 1g cmE2
Wall material:
chamber: expanded polystyrene, chamber: 0.035" Al, 0.125"
PVC, 0.20" polystyrene liner.
Collection
voltage: 375 VDC
Operational
Range: 0.001
to 200 rad/h in three ranges of 100, 20 and 2 rad/h
Accuracy:
15% or two digits in the LSD
Temperature
Dependence: Zero shift ±0.005 0-50 °C, 10% from 10 to
50 °C, lower limit 10 °C
Energy response:
| keV* |
BetaGamma |
Beta |
| 22 |
0.72 |
0.05 |
| 32 |
0.82 |
0.31 |
| 46 |
0.87 |
0.56 |
| 72 |
0.94 |
0.76 |
| 120 |
1 |
0.88 |
| Co60 |
1** |
1** |
* filtered x
rays (HF series filters), ** with 1/8" equilibrium cap.
Warm up time:
30 seconds
Response
time: 3.5 seconds on 2 rad/h range. Less than 1 second on all other
ranges.
Battery:
4 D cells, 150 hours with alkaline batteries, 1 AA cell for light
Internal
controls: Overall calibration and individual range trim and coarse
zero for both channels, High voltage and display frequency. |
