489-110FS GM Pancake Probe with Filter Set

489-110FS GM Pancake Probe with Filter Set

Introduction

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.

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
Model 190-110KT
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

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