Home Enquiry Form Quotation Request Forms Brochure Request Form What's New Product Lists Product User Manuals Product Technical Notes Ultrasound Equipment Ultrasound Transducers Pre-Plugged Seed Needles Seeding/Biopsy Steppers Disposable Grids Disposable Drapes Endocavity Balloons Grid Adapters PAL Pro Stirrups OR Tables / Trolleys Source Measurement Electrometers Equipment Services Suggestions FAQ Search Useful Web Sites Training Courses Calibrations and Upgrades Intravascular Brachy LDR Calibrations Prostate Brachytherapy Prostate Biopsy 3D Prostate Mapping Prostate Cancer Prostate Seed Implant Mammography/Diagnostics Site Map External Beam/IMRT/CT Exradin Ion Chambers Prostate Scanning SeeDs and Strands Seed Implant Dosimetry HDR/PDR Dose Planning HDR MultiSource HDR Gynae Applicators HDR Gynae Template LDR/MDR Curietron HDR IU Sleeves HDR/IORT HAM Applicators HDR/IORT Breast Applicator HDR Prostate Brachy HDR Prostate Template AUTIMO Beam Systems Alloys and Alloy Melters Slideshow Bibliography Our Company Curietron Appeal Iridium-192 Wire Sources Eye Applicators Gold Fiduciary Markers Urology Biopsy Biopsy Guns/Needles Needles/Guns/Applications Clinical Oncology Needles Haematology Biopsy Interventional Radiology Urology Needles/Guns Breast Biopsy/Localisation Gynae Biopsy / Aspiration Skin Biopsy Punch Anaesthesia Needles Antenatal Diagnostic Needle Guides Syringe Holders Biopsy Grids Biopsy Steppers Infection Control-MultiMAT Bone Marrow Biopsy Vertebroplasty Laparoscopy Needles Laparoscopy Support Temno Adjustable Coaxial MRI Biopsy/Localisation Percutaneous Injection-PIA Portable Bladder Scanner Cryotherapy Brachytherapy Template Guided Biopsy Volume Studies Fiducial Marker Placement Micro-Touch Micro-Touch LP NEW EX3 Stepper Classic Stepper Multi-Purpose Workstation Stabilizers Steppers Brachy/Biopsy Accessories

 RAPIDStrand Measurement
Source Holders
HDR1000+ Well Chamber
IVB1000 Well Chamber
Ir-192 Wire Measurement
Ir Wire Loop Measurement
Ir Seeds in Ribbon Measurement
HDR Ir-192 Source Measurement
Metastron Measurement
RAPIDStrand Measurement
I/Pd Seed Measurement
Bard Cartridge
Seed QA
Measurement Justification
Chamber Recal & Upgrade
Calibration Systems
SIRAS System
Seed SourceCheck









Measurement of I-125 RAPID Strand™ Iodine Seeds

Using Source Holder, SeeDOS Code 70026 with the Standard Imaging HDR 1000 Plus Brachytherapy Well Chamber

  • Q A measurements within ± 5% of calibrated 6711 iodine seeds can be made without removing the I-125 RAPID Strand™ from the spacing jig.
  • Short term precision is < 1%.
  • No measureable rotational dependence.


Close up view of I-125 RAPID StrandTM seeds in carrier

I-125 RAPID StrandTM in Source Holder 70023, ready for a measurement

The Source Holder, SeeDOS Code 70026 has been designed for use with the HDR 1000 Plus Brachytherapy Well Chamber and the Max 4000 Electrometer, SeeDOS Code 90015, which provides a quick and convenient QA measurement of I-125 RAPID Strand™ iodine seeds. This custom source holder uses a standard HDR 1000 Plus so your facility can also measure every other brachytherapy isotope, LDR or HDR. This will eliminate the need to invest in several well chambers dedicated to specific isotopes.

The I-125 RAPID Strand™ Source Holder is constructed to simultaneously measure five seeds at one end of the I-125 RAPID Strand™ while the I-125 RAPID Strand™ remains in the spacing jig. The spacing jig is then inverted and the five seeds at the other end are measured. The source holder itself can be sterilized.

Calibration and Correction Factors

An I-125 RAPID Strand™ containing 10 iodine seeds was obtained and an extensive evaluation was performed with the HDR 1000 Plus and the I-125 RAPID Strand™ Source Holder 70023. Following the evaluation, individual seeds of the I-125 RAPID Strand™ were cut from the strand and individually calibrated. To obtain a correction factor, these measurements were compared to the initial, collective seeds measurements of the intact I-125 RAPID Strand™ in Source Holder 70023.

Seed Activity = (R * CF * CT/P * EF)/N

R = reading
CF(correction factor) is defined as 1.15 time the single ADCL 6711 iodine seed calibration factor
N = number of seeds
CT/P = correction for temperature and pressure
EF = electrometer correction factor

SeeDOS would like to thank The University of Wisconsin Accredited Dosimetry Calibration Laboratory (ADCL) in Madison Wisconsin, for performing complete initial performance testing of the I-125 RAPID Strand™ Source Holder with the HDR 1000 Plus Brachytherapy Well Chamber.

Rapid Strand, Metastron, and OncoSeed are trademarks of Amersham plc.

If you are interested in any of the products mentioned here, please fill out an Enquiry Form or a Quotation Request Form, so that we may promptly respond to your request.


Please contact Colin Walters at cwalters@seedos.com if you would like further  information or you have questions

or comments about this web site.
SeeDOS Ltd, 26, The Maltings, Leighton Buzzard, Bedfordshire LU7 4BS, United Kingdom
Tel: +44 1525 850 670  • Fax: +44 1525 850 685