Knowledge Hub · Saxsons Lead Shielding Rings

Dose calibrator · well counter · breakthrough testing — the regulatory framework.

Three chamber applications, one shielding-ring family. The configuration that suits your chamber and your workload is decided in conversation with Saxsons.

PET positron shielding

Why high-throughput PET dose calibrators need the heavier positron tier

At 511 keV (the F-18 / Ga-68 / Cu-64 annihilation peak), lead is a markedly thinner attenuator than at the 140 keV SPECT energy. A PET dose-calibrator chamber running back-to-back calibration cycles therefore needs a heavier lead-shielding tier than its SPECT counterpart. The Saxsons range covers both — the higher tier for the positron-emitter throughput, the workhorse tier for routine SPECT and mid-PET work.

Source: NIST XCOM cross-section database; NCRP Report 49 HVL framework.

Inner-diameter chamber matching

Why the ring slips over the existing chamber without modification

Indian hot-lab dose calibrators ship with a small number of well-defined chamber inner diameters; well counters and breakthrough-test multi-channel analysers ship with their own. The Saxsons range covers the installed-base diameters across all three application types, so the ring drops over the existing chamber and the radiopharmacy does not get locked into a single vendor at the consumable level.

Source: Saxsons hot-lab fit-out reference; manufacturer chamber-geometry specs.

Breakthrough-test setup

Why breakthrough testing needs a shielded counting envelope

Mo-99 / Tc-99m breakthrough testing per the European Pharmacopoeia monograph requires a defined shielded counting geometry around the multi-channel analyser. A lead-shielded setup is the routine answer; the same approach supports Ge-68 / Ga-68 generator breakthrough and Lu-177m radionuclidic-purity testing.

Source: European Pharmacopoeia monograph on Tc-99m breakthrough testing.