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Wipe Test Fixture for Advanced Survey Meter
Home / Fluke Biomedical

Wipe Test Fixture for Advanced Survey Meter

The Wipe Test Fixture for Advanced Survey Meter (Model 489-200WTF) uses a high efficiency NaI(Tl) scintillation probe (Model 489-200) in conjunction with a lead shielded sample holder.

Categories: Fluke Biomedical, Raysafe

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The Wipe Test Fixture for Advanced Survey Meter (Model 489-200WTF) uses a high efficiency NaI(Tl) scintillation probe (Model 489-200) in conjunction with a lead shielded sample holder. It employs a removable wipe test holder or tray positioned below the shielded probe. Under these conditions, background radiation is minimized and wipe test counting is maximized.

Applications:

The wipe test fixture concept evolved from the need to more accurately measure Technetium-99m (99mTc). Most users don’t realize that they are not accurately measuring 99mTc when using a Geiger-Mueller pancake probe. Because of their inherently poor 99mTc efficiency, Geiger-Mueller pancake probes are incapable of accurately measuring 99mTc samples in a timely fashion.

In order to meet current NRC and Agreement state regulations, it would be necessary to count 99mTc samples for a minimum of 30 minutes per sample. The wipe test fixture is designed to precisely measure 99mTc within 30 seconds at efficiencies far surpassing those currently in use. It can count effectively in rate mode and display in any known unit, including “dpm 99mTc or “μCi 99mTc. When used with the ASM-990, or 992 advanced survey meters, the wipe test fixture is able to be calibrated to various other isotopes and thereby expand its role as a wipe test counter.

Effectively detects removable radioactive contamination (wipe testing)
High 99mTc efficiency
Direct reading capability with ASM-990 and 992 Advanced Survey Meters and isotopic calibrations
Removable wipe test sample holder positioned below shielded probe, minimizes background radiation and maximizes wipe test counting

Specifications

Product Specifications
Model 489-200WTF
Size 127 x 127 x 83 mm
Weight 2.45 lb (1.11 kg)
Shielding 6 mm lead
Sample tray spacing 23 mm and 16.5 mm
Sample size 47 mm
Efficiency: 99mTc: 22% efficiency (4 pi), 0.0005 MDA µCi
131I: 24% efficiency (4 pi), 0.0004 MDA µCi
201Tl: 25% efficiency (4 pi), 0.0004 MDA µCi
89Sr: 23% efficiency (4 pi), 0.0004 MDA µCi
90Sr: 4% efficiency (4 pi), 0.0020 MDA µCi
137Cs: 9% efficiency (4 pi), 0.0010 MDA µCi
60Co: 16% efficiency (4 pi), 0.0006 MDA µCi
241Am: 2% efficiency (4 pi), 0.0050 MDA µCi
Probe (Model 489-200)
Type NaI (Tl) pancake, scintillator optically coupled to PMT
Radiation detected Gamma and x-ray above 25 keV, beta above 100 keV
Applications Beta, gamma frisker for nuclear medicine is 10 times more sensitive than GM probe
Crystal dimensions 2 x 2 x 0.5 in (50.8 x 50.8 x 12.7 mm)
Calibration tolerance ± 10%
Weight (approx). 0.78 lb (0.35 kg)

Models and Accessories

Model Name Description
489-200WTF 489-200WTF Wipe Test Fixture for Advanced Survey Meter
Service Packages
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