Nuclear Medicine Blog

Nuke-Tek by Ann Marie Alessi

Dose Calibrator Linearity Testing

June 24, 2016
Ann Marie Alessi, BS, CNMT, NCT, RT(N), Product Sales Manager, Nuclear Medicine, Biodex Medical Systems, Inc.

Linearity testing assesses the ability of the dose calibrator to indicate the correct activity over the range of use of the calibrator.  This test is usually performed using a vial or syringe of Tc-99m whose activity is at least as large as the maximum activity normally measured in a prepared radiopharmaceutical kit, in a unit dosage syringe given to a patient, or in a radiopharmaceutical therapy, whichever is largest. For users of Mo-99/Tc-99m generators this activity may be the total eluate from a fresh generator. Other isotopes can be used to perform linearity such as F-18. >>



Nuke-Tek by Ann Marie Alessi

Dispensing Xenon Xe-133 Gas

October 26, 2015
Ann Marie Alessi, BS, CNMT, NCT, RT(N), Product Sales Manager, Nuclear Medicine, Biodex Medical Systems, Inc.

Xenon Xe-133 Gas is supplied in a mixture of xenon gas (5%) in carbon dioxide (95%). It is contained within septum sealed glass vials and has been proven valuable in the diagnostic evaluation of pulmonary function and imaging of the lungs, as well as assessment of cerebral blood flow. >>



Nuke-Tek by Ann Marie Alessi

Simple Solution to Reduce Exposure from Patient to Technologist

August 11, 2015
Ann Marie Alessi, BS, CNMT, NCT, RT(N), Product Sales Manager, Nuclear Medicine, Biodex Medical Systems, Inc.

There is a lot of concern about diagnostic testing and the use of radiation in the medical field. The concern is equally justifiable for both the patient and health care professional during the procedure. Many reports have been published listing recommendations on how to reduce exposure to both parties. >>



Nuke-Tek by Ann Marie Alessi

Spilled Gas Clearance Time

May 12, 2015
Ann Marie Alessi, BS, CNMT, NCT, RT(N), Product Sales Manager, Nuclear Medicine, Biodex Medical Systems, Inc.

Noble gases such as Xenon in the air present an external source of radiation exposure that must be calculated.  Many commercially available dosimeters and survey instruments are not capable of accurately measuring worker doses from immersion in noble gases . >>



Nuke-Tek by Ann Marie Alessi

The Geometry Test

January 19, 2015
Ann Marie Alessi, BS, CNMT, NCT, RT(N), Product Sales Manager, Nuclear Medicine, Biodex Medical Systems, Inc.

The geometry of the container (syringe or vial) that is used to measure a radioactive source can be a cause of assay errors in dose calibrators. Specifically, if there is a difference in the container used to obtain initial calibration settings and the container used to assay dosages in clinical practice. Ideally, the geometry of the standard source should be identical to the geometry of the source being measured. If the source geometry is not identical, the error in the measurement should be quantified and, if significant, either a new calibration setting determined or a correction factor applied. >>



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