GM Pancake Probe with Filter Set

The Model 489-110FS used in combination with the Model 190 Survey Meter is especially useful for radiation leakage measurements encountered with x-ray emitting laboratory instruments or industrial research equipment, such as electron microscopes, and ion implanters. For service personnel and laboratory technicians, the Model 190 and 489-110FS combination is invaluable for performing “as found” and “final check out” radiation leakage surveys, which are of major importance in any Quality Assurance or personnel safety program. The Model 190 and 489-110FS probe are excellent for gross counting surveys. Once a leak has been found, energy compensating filters can be employed to determine the true exposures.

Energy compensation filter set to determine true dose rate
High detection efficiency
Ergonomic design
Detachable probe cable
Easy to decontaminate

Features

Key Features

The GM Pancake Probe adapted to accept compensation filter set
Set of energy compensation filters to determine true exposure rate
Available as complete kit 190-110KT which includes GM Pancake Probe Filter Set (Model 489-110FS), Survey Meter (Model 190), instruction manual, and carrying ca

Key Features

The Victoreen Model 489-110FS consists of a GM Pancake Probe, which is a hand, held, thin window detector designed for use with the Model 190 Survey Meter, and is configured for operating convenience during table top and floor surveys, as well as surveys of personnel and equipment.

The Model 489-110FS includes the GM Pancake Probe, filter set, connecting cable, operating instructions and calibration certificate. If the Model 489-110FS is purchased as a second detector for the Model 190 Survey Meter, a Model 190060 Calibration Module is also required.

The GM Pancake Probe has been modified to accept a set of two “screw on” energy compensation filters, which permit actual energy compensated exposure rates to be determined.

A screen protects the thin mica probe window to facilitate rapid frisking of surfaces with reduced risk of window damage.

The open area of the hexagonal stainless steel screen is 86%. Replacement foam grip handles are available: Model 489-130-44.

A complete kit: Model 190-110KT (shown on next page) is available which includes the Model 489-110FS Probe, one filter set, the Model 190 Survey Meter, connecting cable with module, calibration certificate, operating instructions, and carrying case.

Model 190-110KT

Specifications

Product Specifications

Detector:

Halogen-quenched “Pancake” GM tube

Radiation detected:

Alpha above 3.5 MeV, beta above 35 keV, and gamma / x-ray above 6 keV, without filters

Operating voltage for 190:

900 V

Window:

15 cm² (1.75 in Ø) mica, 1.4 to 2.0 mg/cm²

Overall accuracy:

Within ± 20% for x-rays and gamma rays; 30 to 300 keV for probe and filters; within ± 10% 300 keV to 60Counfiltered

Typical background:

30 CPM

Sensitivity:

3500 CPM/mR/hr

Protective screen:

Stainless steel, hexagonal pattern providing 86% open area

Construction:

Probe housing is ABS plastic with foam grip handle

Filters:

Set of two metal filters, housed in threaded aluminum
holders; Tin 3.5 mm and Copper 3.0 mm thick

Cable:

Shielded cord; approximately 4.5 ft long, terminated with a
MHV connector

Dimensions

Detector housing:	2.50 (w) x 4.25 (d) x 0.88 in (h) (6.36 x 10.8 x 2.2 cm)
Handle:	1 in Ø x 6.25 in (d) (2.54 x 16.5 cm) (excluding connector)

Weight

0.63 lb (0.28 kg) without cable or filters

Model 190 and 489-110FS combination

Calibrated to within ± 10% accuracy full scale for 137Cs energies up to 80 mR/h exposure rates. Overall accuracy of 190/489-110FS / filters within 20% in the 30 to 300 keV energy range

Efficiency

	The Model 489-110FS Pancake Probe efficiency is shown below without filters. In a recent performance check, the numbers shown represent typical results obtained:
¹⁴C	5%
⁹⁹Tc	12%
¹³⁷Cs	24%
⁹⁰Sr	59%
³⁶Cl	26%
²⁴¹Am	8%
¹²⁹I	2%
²³⁰Th	15%
²³⁹Pu	12%
NOTE:	The efficiency formula used to calculate the % Efficiency is: Eff.%=(CPM x 100) / DPM

GM Pancake Probe with Filter Set

Features

Specifications

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