PET dose calibrator — 511 keV positron shielding
Recommended · 58 mm Pb · 165 / 176 mm inner · 281 / 446 / 498 mm tall
Rule · High-throughput PET radiopharmacy running back-to-back calibration cycles needs the highest tier. Taller stack accommodates multi-sample stacking.
Why · HVL 4.1 mm at 511 keV; 58 mm = ~ 14 HVL — primary annihilation flux removed to essentially zero.
SPECT + mid-PET dose calibrator — 45 mm Pb workhorse
Recommended · 45 mm Pb · 165 / 176 mm inner · 255 / 446 mm tall
Rule · The installed-base workhorse for Indian SPECT and mid-PET hot labs. 255 mm tall covers compact installations; 446 mm tall covers multi-sample stacking.
Why · HVL 0.27 mm at 140 keV (Tc-99m); 45 mm = ~ 166 HVL — overkill margin. At 511 keV the same 45 mm = ~ 11 HVL — engineered envelope for routine PET dispensing.
Well counter (CRC-55tw class)
Recommended · 50 mm Pb · 80 / 160 mm inner · 200 / 350 mm tall
Rule · Sealed-source constancy testing happens inside the well-counter chamber. 50 mm Pb keeps bench-side dose-rate negligible at typical Co-57 / Cs-137 source activity.
Why · 80 mm inner takes the standard small-sample well-counter geometry; 160 mm inner accommodates larger sample-stack work.
Multi-channel analyser (MUCHA Eur.Ph. breakthrough)
Recommended · 50 mm Pb · 86 mm inner · 263 mm tall · with tripod + collimator + top lead
Rule · Mo-99 / Tc-99m breakthrough testing per Eur.Ph. monograph requires a shielded counting geometry around the MCA. The kit ships as a full counting envelope.
Why · Eur.Ph. test requires defined counting geometry; the tripod + collimator + top lead set fixes the geometry across breakthrough-test events.
Saxsons Lead Castle — source-vial bench-side
Recommended · 30 mm Pb · 95 mm inner · 374 / 660 mm tall · with handle
Rule · Source-vial decay stacking and bench-side build-out shielding. Two heights cover compact and tall configurations.
Why · Handle makes bench-to-bench positioning practical; 30 mm Pb is the right tier for source-vial residual activity at the bench-side workflow step.
Spare-part field replacement
Recommended · 45 mm Pb middle-lead ring 3002
Rule · Extending service life of an existing 45 mm Pb dose-cal shielding stack. Swap-in middle section without retiring the full assembly.
Why · Lead-stack damage typically happens at the middle section that takes the most handling. Field replacement keeps the regulator-audit point that the original shielding spec is maintained.
