Feasible Correction of Personal Dosimeters for their Response to Internally Deposited Radionuclides or their Surface Contamination in Nuclear Medicine

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21460%2F24%3A00379212" target="_blank" >RIV/68407700:21460/24:00379212 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1007/s00259-024-06838-z" target="_blank" >https://doi.org/10.1007/s00259-024-06838-z</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Feasible Correction of Personal Dosimeters for their Response to Internally Deposited Radionuclides or their Surface Contamination in Nuclear Medicine

Original language description

During lutetium therapy, not only workers preparing the radiopharmaceutical, administering the radiopharmaceutical and caring for the administered patient in the medical facility but also other hospitalized patients in the same room or persons who accompany the discharged patient home or share a household with him are exposed to a certain amount of external radiation. This exposure, if not managed properly, can pose significant risks to their health. Between April and September 2023, 13 measurements were taken of persons who came into contact with the applied patients (for some people, the measurements were taken repeatedly). Monitoring persons such as drivers transporting the applied patient and family members living with the applied patient was carried out using coats on which pairs of TLDs were placed in 29 positions (20 positions on the chest, abdomen and small pelvis, four positions on each upper limb and 1 position on the back between the shoulder blades) and with the help of an electronic dosimeter, which was placed at the reference point (upper left side of the chest). TLDs were calibrated to show reading in terms of Hp(10). Approximately 20% of the maximum exposure was measured in a location where personal whole-body dosimeters are routinely worn. The maximum exposure in approximately 45% of cases was in the abdominal region, where the dosimeter placement would have an average correction factor value of approximately 1.5 relative to the reference site. If we were to take into account other areas (back of the neck, upper chest, sleeve) where the maximum exposure was measured, relative to the reference site, the values of the correction factors ranged from 1.1 to 6.8. In one case, casing contamination was detected. This local exposure from the contamination was estimated to be approximately 30 times greater than the exposure at a distance of roughly 25 cm from the contamination site, which already corresponded to the average maximum exposure of the other monitored persons. Understanding the spatial distribution of radiation is not just important, it's crucial for individuals in close proximity to patients after lutetium therapy, which can be administered repeatedly (several times a year). This research provides not just insights, but valuable insights into the direction of the dominant radiation, allowing us to recommend not just a suitable geometry, but the most suitable geometry for the treating person towards the patient (maintaining a safe distance from the abdominal area, where, in most cases, the highest radiation was detected). We also suggest not just the use of a suitable correction factor, but the most suitable correction factor when monitoring individuals with a personal dosimeter on the reference site.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

20601 - Medical engineering

Project

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Continuities

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů