Knowledge Hub · Saxsons Lead Shielding Rings
Three chamber applications, one shielding-ring family: dose calibrator (45 / 58 mm Pb positron rings), well counter (50 mm Pb), multi-channel analyser MUCHA (50 mm Pb + tripod + collimator + top lead). Inner-diameter matched to the installed base of Indian vendor chambers.
58 mm Pb positron shielding
At 511 keV (the F-18 / Ga-68 / Cu-64 annihilation peak), HVL in pure lead is ~ 4.1 mm. A 58 mm Pb ring delivers ~ 14 HVL — primary annihilation flux removed to essentially zero. High-throughput PET dose-calibrator chambers running back-to-back calibration cycles need this tier; the 45 mm tier (~ 11 HVL) is the SPECT and mid-PET workhorse.
Source: NIST XCOM cross-section database; NCRP Report 49 HVL framework.
Inner-diameter chamber matching
Indian hot-lab dose calibrators ship with chambers in two dominant inner diameters — 165 mm (Vexcal-class) and 176 mm (Capintec-class). Well counters (CRC-55tw-class) use 80 / 160 mm. Multi-channel-analyser MUCHA shielding uses 86 mm. Saxsons Lead Castles use 95 mm. The ring slips over the existing chamber without modification — no vendor-lock-in at the consumable level.
Source: Saxsons hot-lab fit-out reference; manufacturer chamber-geometry specs.
MUCHA Eur.Ph. breakthrough setup
Mo-99 / Tc-99m breakthrough testing per Eur.Ph. monograph requires a shielded counting geometry around the multi-channel analyser. The Saxsons MUCHA kit ships as 50 mm Pb ring + tripod + collimator holder + top lead — the full counting envelope for the Eur.Ph. breakthrough test. Same kit supports Ge-68 / Ga-68 generator breakthrough and Lu-177m radionuclidic-purity testing.
Spare-part field replacement
The 45 mm Pb dose-cal stack is built from multiple sections — the middle-lead ring 3002 spare-part swaps in without retiring the full assembly. Extends service life of an existing dose-cal shielding build at a fraction of the replacement cost; supports the regulator-audit point that the shielding has been maintained per the original spec.
Source: Saxsons spare-parts catalogue; AERB shielding-maintenance audit framework.
Stacking with interlocking lead bricks
The Saxsons 30 mm Pb Lead Castle + 50 / 60 mm chevron-interlocking brick range stack to build custom shielding caves for source-vial decay stacking, well-counter background suppression and bench-side dose-cal cluster shielding. The chevron interlock prevents straight-line scatter paths through the wall joins; the same brick stack accepts the Lead Castle as a vertical extension.
Source: NCRP Report 147 — Structural Shielding Design for Medical X-Ray Imaging Facilities.
Dose-cal + well-counter + MUCHA shielding design framework.
Eur.Ph. test framework that the MUCHA shielding kit supports.
Indian regulatory framework — dose-cal and well-counter shielding expectations.
Structural Shielding Design — HVL / TVL framework applicable to dose-cal shielding rings.
Authoritative photon attenuation reference for 140–511 keV.