Brochure of the Multi Crystal Gamma Counter
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The Multi Crystal uses high-performance NaI well-type detectors that minimize variance effects caused by sample volume and position to guarantee best counting efficiencies. The crystals cover an energy range from 10 to 510 KeV suitable to detect e.g. 125I, 57Co, 131I, 51CR, 75Se or 99TC. A 6 mm lead shield surrounds each detector, providing 12 mm lead shielding between detectors to decrease interferences such as crosstalk between samples or background radiation.
The 12-detector version of the system enables analysis of 204 samples in 17 minutes (1 minute counting time per sample). More than 1.300 samples/h can be measured using the 24-detector model. A complete series of measurements can be prepared in advance using multiple sample racks. As the Multi Crystal contains no moving parts, sample jamming and expensive belt repairs are never a problem.
The sample rack concept of the Gamma Counter prevents contamination entering the instrument, e.g. via tubes contaminated on the outside. The tubes are placed in racks for signal measurement which can be cleaned and decontaminated easily. And, to satisfy quality management requirements, both the stand-alone version of the software as well as MikroWin support QM functions, including efficiency, absolute & relative background, relative detector efficiency and high voltage adjustment. In order to facilitate instrument QC, single-tube or 12-tube 125I or 57Co sources of 2 KBq/tube are available.
Several software options are available for measurement and data analysis:
12 x 1.25” borehole NaI crystal with photomultiplier tube
|Lead shielding||6 mm lead shielding surrounding each detector, that is 12 mm lead between the detectors|
|Detector crosstalk||0.413 % for 51Cr|
|Energy Range||10-510 KeV|
|Isotopes||125I, 57Co, 51Cr, 99Tc; plus, any other radioisotope within the energy range|
|Efficiency||75% for 125I|
|Tube format||Ø 14.5 mm in rack; Ø 16 mm in borehole|
|CPM raw data||Single or dual channel|
|CPM ratio||RAST, Cr-Release, T3 Uptake|
|RIA||e.g. FT4, single or dual channel|
|IRMA||e.g. TSH, single or dual channel|
|Combined RIA/CPM ratio||e.g. FTI|
|Combined RIA/IRMA||e.g. FT4/TSH|
|Receptor Binding||e.g. ER|
|Assay QC||Based on intra assay controls|
|Instrument QC||Detector efficiency, standardisation, background|
Several options available:
|Interface||Serial RS 232|
|Power Supply||220 V / 50 Hz or 110 V / 60 Hz (depending on model)|
Storage 0-40° COperation 15-35° C
|Regulations||CE, UL, CSA|
|Dimensions (W x D x H)||395 x 510 x 235 mm|
RIA and IRMAmainly with 125I, including, but not limited to:
Other applications with gamma-emitting isotopes:
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Berthold Technologies GmbH & Co.KG
Calmbacher Str. 22
75323 Bad Wildbad
Tel.: (+49) 7081 177 0
Fax: (+49) 7081 177 100