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Energy Response



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.





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

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"

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

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.


Energy Response


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Specifications subject to change without notice.
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