By Vvon Engineering Team | Published | Updated
Select L-blocks, syringe shields and vial shields using radionuclide, activity, container geometry, visibility and safe working access.
Nuclear medicine RFQ checklist (TXT)
Effective bench shielding depends on attenuation, geometry and whether staff can use it correctly during the task. Plan the bench, views, reach and handling together with the physicist; thickness alone does not establish protection.
An L-block puts a shielded body between the operator and the dose while a lead glass window keeps the work in view, and it fails in two ways, both geometric. If the window sits below the operator's eye line for the bench height they actually use, they lean over the top and put their head and chest in front of the shielding. And if there is not enough clear worktop behind it for a vial shield, syringe, swab tray and sharps bin, the dose gets drawn beside the block. The answer is a deeper bench, not a thicker block.
L-blocks are available in several thicknesses and dimensions. Specify the radionuclides, activities, geometry, bench load and work envelope, then confirm attenuation and ergonomic suitability. A 20–30 mm block is not a universal technetium requirement, and a 50 mm label alone does not qualify every PET or therapy task.
A syringe shield is specified by the internal diameter and length of the barrel it accepts, and the ranges are narrow. Nuclear Shields list 1 ml shields at 8.8 x 72, 8.8 x 76 and 11.5 x 76 mm, 2 ml at 11.5 x 53 and 11.5 x 60 mm, 3 ml at 11.5 x 65 and 11.5 x 69 mm, 5 ml at 15.4 x 61, 65 and 68 mm, 10 ml at 18.2 x 75 and 18.2 x 85 mm, and 20 ml at 22.4 x 89 and 22.4 x 96 mm. Two nominally identical 5 ml syringes from different manufacturers are not necessarily the same barrel, so measure what the hospital actually purchases before ordering: a shield that grips too tightly or lets the barrel rattle ends up in a drawer. Then choose the type by what must stay visible and what you are shielding against.
Select syringe shields for isotope, activity, syringe dimensions, grip and visibility. The activity meter measures activity, not syringe volume, so it cannot replace a necessary visual volume check. Beta, dual beta/gamma and PET designs have different purposes; the optimum material and thickness must be assessed for the actual procedure.
Vials come out of shields for two reasons: somebody needs to read the label, and somebody needs to see how much is left. A shield that prevents either gets defeated several times a day. Tungsten vial shields come in 3, 4 and 6 mm walls with magnetic or sliding closures and an internal space of 27 x 61 mm, colour coded so a hot lab can keep one radionuclide separate from another at a glance. Lead glass versions pair a tungsten body with a window so the contents and the level stay visible, with an internal space of 33 x 58 mm. Check your kit and generator vials against those figures: one that will not sit properly gets handled bare.
Hands can receive exposure during both shielded and unshielded work, including through open ends and gaps. Review the entire preparation and administration sequence when selecting holders, carriers and waste containers rather than assume shielded operations contribute no dose.
Dosimetry and observation of the work can help identify where exposure occurs. Rising extremity readings require an investigation of the measurement and the procedure; no fixed shopping list or thickness change will resolve every cause.
Send Vvon the syringe and vial dimensions, radionuclides, activity range and bench layout to discuss Nuclear Shields products. Confirm current fit, attenuation information, delivery and the project scope in the quotation. Contact +8801805987890 or info@vvon.com.bd.
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