Knowledge Hub · Hand-Foot Monitor
A radiopharmacy frisker has two non-trivial design choices: whether it reads both hand surfaces and whether it needs flow gas to do so. Get either wrong and the egress SOP either misses contamination or gets blocked by hardware issues. This page walks why two-step palms+backs and gas-less scintillation are the right answers, and how the unit fits the AERB egress workflow.
Why this matters
The dominant egress contamination pattern
Routine radiopharmacy work — twist-cap vial opening, syringe priming, glove-change sequences — most often contaminates the back of the hand and the wrist seam where the glove meets the cuff. A single-pass frisker reading palms only walks the dominant failure mode straight out of the controlled area. The two-step protocol (palms, then turn over for backs) reads both sides explicitly. The operator does not have to remember to flip; the voice prompt and the screen instruct the sequence.
Based on: IAEA Safety Reports Series 40 — Operational Radiation Protection in Nuclear Medicine.
Read source ↗Gas-less scintillation
Traditional hand-foot frisker designs use proportional counters that require P-10 or methane flow gas to operate. The smart-scintillation design is solid-state, no gas. Practical consequences: no gas-cylinder procurement, no flow-regulation hardware, no consumable changeout schedule, no gas-bottle facility-safety dossier, no risk that a low-flow alarm holds the egress lane closed during the morning rush.
Based on: Manufacturer product page — detector technology section.
Read source ↗α + β + γ coverage
A radiopharmacy dispensing Tc-99m, F-18, Ga-68, Lu-177 and I-131 needs a frisker that covers β-particle emitters (Tc-99m, Lu-177), γ emitters (Ga-68 511 keV, I-131 364 keV) and the rare α-emitter contamination event. The detector chemistry covers all three radiation types in one unit — the operator does not select isotope, the device reads the surface contamination directly.
Based on: AERB Safety Code for Nuclear Medicine Facility — contamination control section.
Read source ↗Dynamic background-adaptive timing
A fixed-time frisker reads either too long (when background is low and the answer is obvious quickly) or too short (when background is high and statistics demand a longer count). The dynamic-processing algorithm reads the instantaneous background and adapts measurement time per session. Egress queue length drops; counting statistics improve.
Based on: Manufacturer product page; ISO 7503 surface-contamination measurement guidance.
Read source ↗Ethernet LAN standard
Ethernet is the default network interface — no add-on serial-to-network bridge required. Every measurement event, every alarm, every operator session is logged to the central RMS server with a time stamp. The radiation-safety officer sees the contamination event log next to the area-gamma trend next to the stack-release trace, all in one console.
Based on: Manufacturer product page — connectivity section.
Read source ↗AERB egress SOP
AERB Safety Code for Nuclear Medicine Facility expects every staff egress from the controlled area to include a contamination check. The standard implementation is: gowning-off, hand wash, hand-foot reading, signed log, exit. The Ethernet-fed log feeds the AERB inspection-ready dossier alongside the personnel-dose records.
Based on: AERB Safety Code for Nuclear Medicine Facility.
Read source ↗IAEA, AERB and ISO documents that frame hand-foot contamination control in nuclear medicine.
IAEA framing for nuclear-medicine operational radiation protection, including contamination-control SOPs.
Indian framework for nuclear-medicine facility licensing, including contamination-control expectations at egress.
International standard for surface contamination measurement methods — alpha, beta and gamma.