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The
HPI model 1010 is a portable survey meter. It can accurately and
quickly evaluate low level continuous or pulsed radiation fields,
and also provides a tool for general surveying of penetrating radiation
hazards.
The instrument can be used to scan for near background levels on
the 0.1 mrad/h range. If accurate measurements are needed at these
levels, the dose can be integrated for a short time using the 0.01
mrad range. Used in this manner the Model 1010 becomes a fence post
monitor.
The detector is tissue equivalent, and all measurements are taken
as the absorbed dose in soft tissue. In mixed radiation fields which
would be in the vicinity of accelerators, or in gamma-neutron fields,
the reading can be corrected by a quality factor to obtain the dose
equivalent.
The instrument’s high sensitivity, wide range, and tissue equivalent
response are the result of an HPI developed multiplying ion chamber.
It is made of tissue equivalent plastic and is operated with gas
multiplication. This detector makes possible a survey meter with
unsurpassed characteristics: tissue response, a sensitivity of 0.1
mrad/h full scale, and a wide range extending to 1 rad/h in 5 linear
decade ranges.
Options include a beta window, a built in digital timer, and a push
button reset switch.
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MEASURES BACKGROUND RADIATION WITH ION CHAMBER
RAD RESPONDING
MEASURES
GAMMAS AND NEUTRONS
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Specifications
Mechanical
Dimensions: Height 14 3/4" (35 cm), width 5-1/4’1(13.5cm),
depth 4" (10 cm)
Weight:
5 1/4 pounds (2.4 kg)
Case: Painted
and anodized aluminum
Detector
Type: Sealed tissue equivalent multiplying ion chamber
Volume:
150 cc; Filled with 100 Torr TE gas
Wall: Material:
Al50 conducting TE plastic; Thickness: TE Plastic: 0.07",
AL can: 0.065"
Operational
Readout: 3-1/2" Taut band meter
Ranges:
Ratemeter Ranges: 0-0.1, 1, 10, 100, 1000 mrad/h. Integrate Ranges:
0-0.01, .1, 1 mrad
Reproducibility:
±15%
Temperature
Dependence: ±15% 0 to 50° C
Energy
Response: Approximate tissue from 1.3 MeV to 100 keV; 1.25 MeV
to 100 keV: 2%; 70 keV: -3%; 40 keV: -25%
Warm-up
Time: 30 seconds
Switching
Transients: 2 seconds between ranges
Response
Time: 0.1 mrad/h: 10 sec.; 1.0 mrad/h; 5 sec.; 10 mrad/h: 2.5
sec. Others: less than 2 sec.
Rate Response:
95% collection at 1 rad/h. Integrate ranges should not be used
above 10 rad/h.
Batteries:
4 D cells, 80 to 100 hours with alkaline batteries
External
Controls: Range switch with positions; OFF, BATTERY CHECK, 1000,
100, 10, 1, 0.1, mrad/h full scale, RESET, 1, 0.1, 0.01 mrad full
scale
Internal
Controls: HV adjust (overall sensitivity), electrometer zero,
three range trim adjustments
Options
Reset Switch: Mounted below meter. May be depressed with thumb
while holding instrument. Switch performs same function as reset
position on range switch.
Beta Window:
End of chamber opened to approximately 80%. Window is 1 mil stainless
steel (approx. 20 mg/cm2)
Timer:
Timer built into meter housing. 3 digits XXX seconds. Timer is
initiated,stopped and reset with reset switch.
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