Eberline ESP-1 - Page 96

Model HP-190-A
Hand Probe
A. GENERAL DESCRIPTION
The Model HP-190A hand probe uses a thin end-
window GM tube for detection of relatively low energy
beta and provides a limited sensitivity to high energy
alpha particles. The HP-190A does not have energy
compensation; therefore, it is not recommended for
gamma exposure rate measurements.
B. SPECIFICATIONS
Operating Voltage: 900 + 50У
Plateau Length: 100 Y minimum
Plateau Slope: 0.1 percent per V maximum
Dead Time: 200 zs maximum
Temperature Range: —67? F to + 167° F
(—55° C to +75° C)
Mica Window Thickness: 1 !/8- inch-diameter (2.9 cm)
€ THIN END WINDOW
€ HIGH BETA SENSITIVITY
€ WINDOW PROTECTIVE SCREEN
Gamma Sensitivity: z 2500 cpm/mR/h (9105) (into
window)
*Beta Efficiency:
=35 percent *Sr-°°Y
2:25 percent °Tc
= 10 percent "C
Alpha Sensitivity: 3 MeV at window
Connector: BNC series coaxial
Size: 1 2/8 inches in diameter x 4 7/8 inches long
(3.5 cm x 12.4 cm)
Weight: 5.5 ounces (155 g)
*Measured without screen cap. With cap in place, effi-
ciency will be Ξ:50 percent of values listed. Efficiencies
listed as percent of 27 emission rate from a one-inch-
diameter source.
HP-190A
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