CRC-55-tw Dose Calibrator and Well Counter


The CRC55tW is a combination of the CRC®-55tR Dose Calibrator and Well Counter, useful for measuring activity and preparing doses. The ion chamber is capable of measuring a dose up to 6 Ci (250 GBq) with accuracy. The CRC-55tW calibrator features a new chamber plug-and-play capability.

For wipe testing, the CRC-55tW calibrator allows the user to define specific counting procedures with trigger levels for work, patient, unrestricted areas and sealed source leak tests. The CRC-55tW unit performs counting functions for wipe tests in approximately six seconds at activities down to 1 nCi. Low activities are measured with a drilled well high sensitivity Sodium Iodide (NaI) detector.

The well counter includes a 256 channel MCA which provides detailed spectrum for identification and analysis. Manual and automatic ROI selection are available. The chamber and counter of the CRC-55tW calibrator are combined in a menu driven, touch screen interface that is user-friendly.

Reports software, new for the CRC-55t-W unit, archives well counter data for quality assurance procedures, wipe measurements and laboratory tests. Well counter reports are stored and searchable by date range for later viewing or printing. Wipe tests are searchable by date range, wipe type, and activity.


Console Dimensions

Height: 24 cm (9.5 in.)
Width: 23 cm (9.0 in.)
Length: 27 cm (10.5 in.)
Weight: 3.4 kg (7.5 lb)

Chamber Dimensions

Height: 43.8 cm (17.25 in.)
Diameter: 17.2 cm (6.76 in.)
Weight: 13.6 kg (30 lb)
Well Diameter: 6.1 cm (2.4 in.)
Well Depth: 25.4 cm (10.0 in.)
Cable Length: 3.7 m (12 ft)

Well Counter Dimensions

Height: 23.8 cm (9.38 in.)
Diameter: 15.2 cm (6 in.)
Weight: 6.9 kg (15.2 lb)
Well Diameter: 1.7 cm (.67 in.)
Well Depth: 3.8 cm (1.5 in.)
Cable Length: 2.7 m (9 ft)

Well Detector

Type: Sodium Iodide (NaI) drilled-well crystal detector, 256 Channel MCA, manual and automatic ROI
Warning Trigger Levels: User-definable
Tests: Daily test, energy calibration, and reproducibility
Enhanced QC includes Chi-Square and MDA

Ionization Chamber

Fill Gas: 12 atm Ultra-Pure Argon
Measurement: Auto ranging
Activity Range: Up to 6 Ci (250 GBq)
Resolution: .001 MBq (.01 μCi)
Response Time: Within 2 sec, for low activity sample, 4 to 16 sec
Tests: Daily tests include Auto Zero, Background Adjustment, Voltage

Test, Data Check, Accuracy and Constancy

Enhanced QC includes linearity, geometry, strip QC

Display Screen

Type: 8 in. VGA LCD color touch screen display
Bq/Ci Reading: User selectable or fixed
Activity Display: Selected radionuclide, calibration number, measured activity and display units (Bq/Ci)
Count Rate Values: Wipe results


Accuracy: Better than ± 2%
Linearity: Within ± 2%

Repeatability of Measurement

Within ± 1% within 24 hours during which time the calibrator is powered at all times

Nuclide Data

Nuclide Setting Keys: 28 programmable keys
System Memory: Over 80 nuclides (cal number and half-life) • A pre-set key measures up to 2.0 Ci (74.0 GBq) of F-18

Standard Source Data

System Memory: Co-57, Co-60, Ba-133, Cs-137

Molybdenum-99 Assay

Methods: CapMac and canisters
Measured Values: Mo-99 elution, Tc-99m, Tc-99m/Mo-99 ratio

PC Port

Interface: RS-232 and USB
Compatibility: Standard Nuclear Medicine Management Systems


RS-232 and USB Ports
Epson Roll, Epson Slip or Okidata dot matrix

Power Requirements

100-240 V ac (50/60 Hz) 100 MA


Diagnostics: Full test of program, system memories


Printer (Optional): 1.8 m (6 ft) • Power: 1.8 m (6 ft)

Ordering Information

Item #5130-2216 CRC-55tW Dose Calibrator
Item #5420-2072 Auxiliary Shield
Item #7300-2004 Liner
Item #5430-0058 Epson Roll Printer
Item #7120-1199 CRP-200 Dose Tickets & Labels
Item #5430-0100 Epson Ticket Printer
Item #7300-2450 Environmental Shield
Item #7300-2005 Dipper