Authorised Indian Distributor
Saxsons Group
New Delhi, India · Since 1997
Dose Calibrator QA SourcesNIST-Traceable Reference Standards
NIST-traceable sealed radioactive reference sources for dose calibrator constancy, accuracy and linearity quality assurance. Available in Co-57, Co-60, Cs-137 and Ba-133 — individually or as sets — for daily, monthly and annual QA programmes per AERB requirements.
Key Features
- NIST-traceable calibration — direct comparison to national standards
- Available in Co-57, Co-60, Cs-137 and Ba-133 — individually or as sets
- ±5% measurement accuracy across the calibrated activity range
- Consistent 30 mL polyethylene vial geometry for reproducible measurements
- Colour-coded sources for instant visual identification
All Features
- NIST-traceable calibration — direct comparison to national standards
- Available in Co-57, Co-60, Cs-137 and Ba-133 — individually or as sets
- ±5% measurement accuracy across the calibrated activity range
- Consistent 30 mL polyethylene vial geometry for reproducible measurements
- Colour-coded sources for instant visual identification
- Epoxy matrix activity composition — uniform distribution, no settling
- Sealed construction — no contamination risk, long-term stable geometry
- Activity certificate with calibration date and NIST traceability statement
- Long half-life isotopes — years of service from a single set
- Covers the energy range of all clinical nuclear medicine isotopes
- Supports constancy, accuracy and linearity QA per AERB requirements
- Available as a complete 4-source QA set for annual dose calibrator testing
Technical Specifications
| Isotopes available | Cobalt-57 (Co-57); Cobalt-60 (Co-60); Caesium-137 (Cs-137); Barium-133 (Ba-133) |
| Physical form | Radioactive epoxy in 30 mL polyethylene vial (sealed) |
| Activity composition | 20 mL active epoxy volume — uniform radionuclide distribution |
| Accuracy | ±5% (calibrated by direct comparison to NIST standards) |
| Traceability | NIST (USA National Institute of Standards and Technology) |
| Geometry | Consistent 30 mL vial — same as clinical radiopharmaceutical vials |
| Colour coding | Each isotope colour-coded for unambiguous visual identification |
| Half-lives | Co-57: 272 d; Co-60: 5.27 y; Cs-137: 30.1 y; Ba-133: 10.5 y |
| Activity certificate | Provided; calibration date, stated activity, NIST statement |
| Energy coverage | Ba-133 (81 keV) to Co-60 (1,173 / 1,332 keV) — full clinical range |
| AERB classification | Sealed source; AERB licence required; documentation supplied |
Applications
Dose calibrator QA — the reference behind every dispensed patient dose
Daily Constancy Check
AERB and AAPM require daily constancy testing of every dose calibrator. A single long-lived source (Co-57 or Cs-137) placed in the dose calibrator well verifies consistent instrument response before the first patient dose.
Annual Accuracy Verification
Annual accuracy testing per IAEA TECDOC-602 and AERB regulations. The measured activity must match the source certificate within ±10% (accuracy). NIST traceability makes the result defensible at regulatory inspection.
Linearity Testing
Cs-137 (30-year half-life) used for linearity testing methods where decay linearity cannot be used. Verify the dose calibrator response is linear across the clinical activity range (37 kBq to several GBq).
Energy Geometry Calibration
Each isotope's photon energy tests the dose calibrator's geometry factor at a different energy point. The Ba-133 / Cs-137 / Co-57 / Co-60 set covers 81 keV to 1,332 keV — spanning all clinical radionuclides.
NABH / JCI Accreditation
Accreditation standards require documented dose calibrator QA with NIST-traceable sources. Source certificates, constancy records and accuracy test results form the required QA dossier.
New Isotope Geometry Factors
When adding a new isotope (e.g., Ac-225, Pb-212) to the clinical programme, the reference source set helps establish and verify the geometry/calibration factor for the new radionuclide.
Why Dose Calibrator QA Sources?
NIST-traceable calibration means your dose calibrator QA result has an unbroken chain to the US national measurement standard. This satisfies AERB requirements, supports NABH accreditation and withstands regulatory challenge.
Ba-133 (81 keV), Co-57 (122 keV), Cs-137 (662 keV) and Co-60 (1,173/1,332 keV) bracket the full photon energy range of clinical radionuclides. One set covers every dose calibrator QA requirement across diagnostic and therapeutic programmes.
Long half-life isotopes and sealed epoxy matrix construction deliver years of QA service from a single source set. No liquid handling, no contamination risk, no geometry variation — just repeatable, reliable reference measurements.
Catalogs & Resources
Manufacturer product page. Contact Saxsons for AERB licence documentation, source-set pricing and replacement scheduling.
Dose Calibrator QA Sources
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Contact Saxsons Group for NIST-traceable QA source sets, AERB licence documentation and constancy testing support in India.