Thyroidal 131I Monitoring System Using Whole-Body Counter Capabilities

Lahham, Adnan; Fülöp, M.; Ragán, Péter

doi:10.1093/oxfordjournals.rpd.a082129

Cited by 13 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To the best of our knowledge, in the case of thyroid monitoring, a model for the variation of counting efficiency as a function of distance has never been reported. Nevertheless, the data shown in (Lahham et al 1994, Ulanovsky et al 1997, Ha et al 2017 tends to confirm our finding of an inverse square law. In our study, the mathematical expression that is presented is not exactly an inverse square law, but the exponent in equation (3) is 2.32 for the HPGe detector and 2.19 for the NaI(Tl) detector.…”

Section: Influence Of Distance On Counting Efficiencysupporting

confidence: 80%

“…In (Lahham et al 1994) it was reported that the efficiency difference is 94% for an adult man (20 ml) and 97% for a child (10 ml) for a variation of counting distance between contact and 20 cm. This result was obtained experimentally with a germanium detector.…”

Section: Influence Of Distance On Counting Efficiencymentioning

confidence: 98%

“…Taking into account computational studies (Venturini 2003, Bento et al 2012, Moraleda and Gómez-Ros 2015 and experimental studies (Karachalias 2013, Lahham et al 1994, Ulanovsky et al 1997, where both approaches are used, it can be deduced that the difference in counting efficiency between young children and adults is:…”

Section: Influence Of Thyroid Volume On Counting Efficiencymentioning

confidence: 99%

“…Several studies-some computational and other experimental-were carried out in order to evaluate the influence of many parameters such as thyroid volume, thyroid shape, thyroid depth inside the neck, detector size and position (Lahham et al 1994, Lenton and Bowlt 1994, Bhati and Patni 2009, Moraleda and Gómez-Ros 2015. For example, the variation in the counting efficiency with thyroid volume was studied using Monte Carlo calculations by (Ulanovsky et al 1997, Venturini 2003.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A systematic experimental study of parameters influencing 131-iodinein vivospectroscopic measurements using age-specific thyroid phantoms

Beaumont¹,

Rimlinger²,

Broggio³

et al. 2018

J. Radiol. Prot.

View full text Add to dashboard Cite

In case of nuclear accident, the internal exposure monitoring of the population will preferably focus on the detection of I in the thyroid by in vivo monitoring. In most cases, the calibration of in vivo monitoring is performed with an adult thyroid phantom, which raises doubts regarding the relevance of child exposure assessment. In this study, the influence on the calibration of the thyroid volume, the counting distance and the positioning variations are studied experimentally in a systematic way. A NaI and a germanium detector along with a realistic age-specific set of four thyroid phantoms were used to carry out this study. The thyroid phantom volumes correspond to the following ages: 5, 10, 15 and adult. It was found that the counting efficiency varies linearly with the thyroid volumes for both detectors and whatever the phantom-detector distance is. The variation in counting distance strongly influences the measurement. Whatever the thyroid volume, a 30% difference in efficiency was found between the measurement at the contact and 1 cm for the NaI detector. A mathematical model giving the variation of the counting efficiency as a function of phantom-detector distance is provided. The study of positioning uncertainty has shown that the lateral/vertical displacements induce negligible efficiency variations and that it is relatively independent of the thyroid volume. The counting distance is a major parameter, which must be considered to assess the uncertainty of the subjects' measurements. The data reported here might serve to extract useful orders of magnitude when similar detectors are used. For other detectors, a similar trend might be expected and the information provided here could reduce the amount of experimental work needed to obtain it.

show abstract

Section: Influence Of Distance On Counting Efficiencysupporting

confidence: 80%

Section: Influence Of Distance On Counting Efficiencymentioning

confidence: 98%

Section: Influence Of Thyroid Volume On Counting Efficiencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A systematic experimental study of parameters influencing 131-iodinein vivospectroscopic measurements using age-specific thyroid phantoms

Beaumont¹,

Rimlinger²,

Broggio³

et al. 2018

J. Radiol. Prot.

View full text Add to dashboard Cite

show abstract

“…In the study of occupational radiation protection in nuclear medicine in China, on the nuclear medical staff who directly operated the nuclides based on the above decision principles, and the results showed that about 70% of the staff who directly operated the nuclides in the nuclear medical disciplines surveyed needed internal radiation monitoring. [12][13][14][15][16][17][18] (2) Internal radiation monitoring and dose estimation of nuclear medicine workers. Internal irradiation monitoring is mainly carried out by air sampling, in vitro direct measurement, biological sample analysis and other methods.…”

Section: Discussionmentioning

confidence: 99%

Study of the Internal Exposure Monitoring and the New Monitoring Methods of Thyroid I-131 for Radiological Staff in Nuclear Medicine

Liu

2020

Preprint

View full text Add to dashboard Cite

Background：In general, medical staff dealing with nuclear medicine should be entirely safe in their professional environment. Nevertheless, their exposure to radioactive iodine seems to be partially uncontrolled while they perform their duties, namely while administering iodine in the form of tablets or solutions or while taking care of the patients already treated with the isotope. Purpose: To verify such a hypothesis, develop a simple method for internal exposure monitoring，131I activity measurements in the thyroids of the personnel employed at the three hospitals of Gansu province grade a hospital nuclear medicine. Mastered the internal exposure of nuclear medical personnel.Methods: Choosing 20 employees of the department of three hospitals of gansu province grade a hospital nuclear medicine, which corresponds to circa 100% of all of the all the staff of the nuclear medicine department who carry out iodine therapy. Automatic packaging and drug delivery staffs were 6, manual packaging and drug delivery staffs were 14. According to the rules of the judgment principles proposed in IAEA safety guidelines, An InSpector 1000 portable spectrometer and its supporting software served as the basic research instrument. In four out of twenty examined staff members. The sitting position was adopted with NaI portable spectrometer. The measurement time was 120s. Result: Among the manual packaging and drug delivery staffs was 4 (20.0%) detected 131I in the thyroid, with activity range of 27.6-1030.3Bq. Automatic packaging and drug delivery staffs were not detected. Conclusions: The highest activities in thyroids were detected for the manual packaging and drug delivery staffs, Automatic packaging and drug delivery staffs were not detected. The dose of some workers is high, so the prevention and control of pollution in nuclear medicine discipline needs to be strengthened urgently.

show abstract

Characterization of an in vivo thyroid 131I monitoring system using an imaging plate

Hirota

Saze

Nishizawa

2004

Applied Radiation and Isotopes

View full text Add to dashboard Cite

Thyroidal 131I Monitoring System Using Whole-Body Counter Capabilities

Cited by 13 publications

References 0 publications

A systematic experimental study of parameters influencing 131-iodinein vivospectroscopic measurements using age-specific thyroid phantoms

A systematic experimental study of parameters influencing 131-iodinein vivospectroscopic measurements using age-specific thyroid phantoms

Study of the Internal Exposure Monitoring and the New Monitoring Methods of Thyroid I-131 for Radiological Staff in Nuclear Medicine

Characterization of an in vivo thyroid 131I monitoring system using an imaging plate

Contact Info

Product

Resources

About