Dispensing workflow · PET Tungsten Syringe Shield
The same tungsten 9 mm chassis covers FDG, Ga-68, Lu-177 and Cu-64 — the workflow differences are size selection, size-coded cap identification, and per-isotope ergonomics. This page is the per-line build sheet and the extremity-dose record entry each line writes into the AERB dossier.
Shield size + variant
3 cc turn-lock (RPSS-3-9-9-T-P-N)
Activity profile
350–550 MBq per patient dose; 30–40 doses per shift typical
Photon energy
511 keV annihilation photons
Ergonomics + workflow
9 mm tungsten wall + lead-glass window; one-handed turn-lock cycle in ~1 s per dispense. Black size cap means the workhorse 3 cc shield gets picked up at glance-speed.
AERB record: Per-dispense extremity dose logged via TLD ring badge; cumulative monthly value entered in the operator dose register
Shield size + variant
2 / 3 cc turn-lock (RPSS-2-9-9-T-P-N or RPSS-3-9-9-T-P-N)
Activity profile
100–200 MBq per patient dose; 1–4 doses per generator elution
Photon energy
511 keV annihilation + 1077 keV pair line (low intensity)
Ergonomics + workflow
Same tungsten 9 mm geometry as the FDG line. Red size cap on the 2 cc shield and Black on the 3 cc — operator picks the size the patient dose volume calls for at glance-speed.
AERB record: Generator-licence paperwork pairs with the syringe-shield extremity-dose log on the AERB inspection dossier
Shield size + variant
5 / 10 cc — 5 cc turn-lock (RPSS-5-9-9-T-P-N) for ≤4 GBq, 10 cc thumb-screw (RPSS-10-9-9-T-P-N) for ≥4 GBq
Activity profile
4–7.4 GBq per theranostic patient dose; 1–3 patient doses per session
Photon energy
113 / 208 keV photons + β⁻ + minor 511 keV annihilation from internal pair production
Ergonomics + workflow
Higher activity per dose means longer dispense per cycle; 9 mm tungsten still covers the dose-rate but the operator stays inside the body shield of the Lead-Lined Fume Hood during dispense. Blue size cap on the 5 cc shield prevents an accidental 3 cc pick-up at theranostic activities.
AERB record: High-activity dispensing — extremity dose log paired with whole-body TLD log; site theranostic licence covers the dispensing-line operation
Shield size + variant
1 / 2 cc thumb-screw or turn-lock (RPSS-1-9-9-T-P-N / RPSS-2-9-9-T-P-N)
Activity profile
Per investigator-protocol; typical research dose 50–200 MBq
Photon energy
511 keV annihilation + 1346 keV gamma
Ergonomics + workflow
Small-volume dispense; 9 mm tungsten covers the 511 keV but the 1346 keV gamma needs additional working-distance discipline (forceps + body shield). Red size cap on the 2 cc shield identifies the research-use volume.
AERB record: AERB IIP licence covers the dispensing-line operation; investigator-protocol acceptance criteria define the per-dispense activity ceiling
Ring-badge extremity-dose monitoring
Each operator on the dispensing line wears a TLD ring badge on the dominant hand during PET dispensing shifts. The badge integrates extremity dose across the shift; monthly readouts roll up into the annual ICRP / AERB 500 mSv budget. The tungsten 9 mm shield is the design intervention that keeps the per-dispense extremity dose well below the level where the annual budget gets tight — but the ring badge is the measurement that confirms the intervention is working installation by installation, shift by shift.
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