title: A comparison of dose savings of lead and lightweight aprons for shielding of 99m-Technetium radiation.
abstract: Nuclear medicine technologists (NMTs) have the highest effective doses of radiation among medical workers. With increase in the use of lightweight materials in diagnostic radiography, the aim was to compare the effectiveness of lead and lightweight aprons in shielding from 99m-Technetium ((99m)Tc) gamma rays. The doses received from a scattering phantom to the entrance, 9cm depth and exit of a phantom were measured with LiF:Mg, Cu, P thermoluminescent dosemeters (TLDs). Doses and spectra were assessed without no shielding, with 0.5-mm lead and lightweight aprons. The lead and lightweight aprons decreased entrance surface doses by 76 and 59%, respectively. The spectral analysis showed that the lightweight apron provided better dose reduction at energies <95 keV, though lead was 35% more efficient at higher energies. While lead apron demonstrated better shielding, the additional savings should be considered with the weight differential. It is concluded that the lightweight apron is suitable to be worn by NMTs interacting with patients injected with a (99m)Tc labelled radiopharmaceutical.
authors.affiliation: Medical Radiation Science, School of Health Sciences, University of Newcastle, Newcastle, NSW, Australia. helen.warren-forward@newcastle.edu.au
authors.forename: Helen
authors.initials: H
authors.lastname: Warren-Forward
authors.forename: Paul
authors.initials: P
authors.lastname: Cardew
authors.forename: Bradley
authors.initials: B
authors.lastname: Smith
authors.forename: Llewellyn
authors.initials: L
authors.lastname: Clack
authors.forename: Kym
authors.initials: K
authors.lastname: McWhirter
authors.forename: Stacey
authors.initials: S
authors.lastname: Johnson
authors.forename: Kimberly
authors.initials: K
authors.lastname: Wessel
mesh_terms: D001822:Body Burden; D006801:Humans; D007854:Lead; D016273:Occupational Exposure / Q000032:analysis* / Q000517:prevention & control*; D011481:Protective Clothing; D011829:Radiation Dosage; D011835:Radiation Protection / Q000295:instrumentation* / Q000379:methods; D011874:Radiometry; D012062:Relative Biological Effectiveness; D018570:Risk Assessment / Q000379:methods; D012307:Risk Factors; D013667:Technetium / Q000032:analysis*
chemical_list: D007854:Lead; D013667:Technetium