Energy and angular dependence of the personal dosemeter in use at ITN-DPRSN

Alves, José L. D.; Calado, Adriana Santos Cunha; Cardoso, J.; Santos, Luís

doi:10.1016/j.radmeas.2007.11.079

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…Dosimeters were read using two Harshaw 6600 readers. The extremity dosimeters were calibrated in terms of H p (0.07) using a N120 X‐ray beam incident on an ISO rod phantom, and the WB dosimeters were calibrated in terms H p (10) and H p (0.07) using a 137 Cs beam incident on a ISO water phantom . The minimum limit of detection is 0.02 mSv in terms of H p (10) and H p (0.07) for WB detectors, and 0.07 mSv in terms of H p (0.07) for the extremity detectors.…”

Section: Methodsmentioning

confidence: 99%

The use of needle holders in CTF guided biopsies as a dose reduction tool

Sarmento

Pereira

Sousa

et al. 2017

J Applied Clin Med Phys

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PurposeThe purpose of this study was to evaluate the efficacy of needle holders in reducing staff hand exposure during biopsies guided by computed tomography fluoroscopy (CTF), through the analysis of data acquired during a detailed monitoring study, undertaken in parallel with an ongoing optimization process to reduce hand irradiation.MethodsHand monitoring was performed with 11 extremity detectors, two per finger (base and tip) and one on the back of the wrist, for the left (dominant) hand, during two series of biopsies with comparable characteristics. The first series (47 biopsies) were performed with only quick‐check method (QC) and occasional side‐handle (SH) manipulation of the needle. The second series (63 biopsies) were performed after introducing needle holders (NH) in the course of an optimization process.ResultsChoice of technique (QC, QC + NH, QC + SH) by the interventional radiologist (IR) was related to biopsy difficulty. Measured hand exposure was low (< 1 mSv) for all QC‐only procedures, and for most of the QC + NH procedures. Occasional side‐handle manipulation still occurred during challenging biopsies, so that 8% of biopsies in the second series accounted for ~70% of total fingertip dose (~90 mSv). The methodology used allowed a detailed insight into the dose reduction achievable with needle holders during real procedures, without the limitations of phantom measurements.ConclusionsNeedle holders proved effective in reducing mean hand exposure during clinical procedures where real‐time manipulation was necessary. Occasional side‐handle manipulation was found to contribute disproportionately to hand exposure. This highlights the importance of individual hand monitoring during CTF guided procedures.

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Section: Methodsmentioning

confidence: 99%

The use of needle holders in CTF guided biopsies as a dose reduction tool

Sarmento

Pereira

Sousa

et al. 2017

J Applied Clin Med Phys

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“…

H_{p}

(0,07) is defined as the dose equivalent to soft tissue at a depth 0.07 mm below a specified point on the body. The TLDs were calibrated in terms of

H_{p}

(0.07) using a N120 X‐ray beam incident on an ISO rod phantom (17–20) . The limit of detection is 0.07 mSv in terms of

H_{p}

(0.07).…”

Section: Methodsmentioning

confidence: 99%

Gafchromic XR‐QA2 film as a complementary dosimeter for hand‐monitoring in CTF‐guided biopsies

Sarmento

Pereira

Sousa

et al. 2016

J Applied Clin Med Phys

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Computed tomography fluoroscopy (CTF) is a useful imaging technique to guide biopsies, particularly lung biopsies, but it also has the potential for very high hand exposures, despite use of quick‐check method and needle holders whenever feasible. Therefore, reliable monitoring is crucial to ensure the safe use of CTF. This is a challenge, because ring dosimeters monitor exposure only at the base of one finger, while the fingertips may be exposed to the highly collimated CT beam. In this work we have explored the possibility of using Gafchromic XR‐QA2 self‐developing film as a complementary dosimeter to quantify hand exposure during CTF‐guided biopsies. A glove used in a previous study and designed to contain 11 TLDs was adapted to include Gafchromic strips 7 mm wide, covering the fingers. A total of 22 biopsies were successfully performed wearing this GafTLD glove under sterile gloves, and the IR reported no difficulty or reduction of dexterity while wearing it. Comparison of dose distributions obtained from digitization of the Gafchromic film strips and absolute Hp(0.07) readings from TLDs showed good agreement, despite some positional uncertainty due to relative movement. Per procedure, doses at the base of the ring finger can be as low as 3%–8% of hand dose maximum. Accumulated dose at the base of the ring finger was four times lower than the dose maximum.PACS numbers: 07.57.Kp, 29.40.‐n, 85.25.Pb, 87.57.qp

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“…Some well-known reference sources used in the calibration procedure are Cs-137, Co-60, and Sr-90/Y-90 (International Commission on Radiation Units and Measurements 1992, Szumska et al 2013, Wrzesień 2020. Moreover, calibrations are also performed with the use of low-energy x-rays (Alves et al 2008, Borges et al 2014, Wrzesień 2019, Kr-85, or using the self-irradiation phenomenon of detectors made of potassium halide (Pashchenko et al 1995).…”

Section: Introductionmentioning

confidence: 99%

The correction factors for UD802 dosimeters irradiated with different radiation energies and at different incidence angles

Grygier¹,

Skubacz²,

Chałupnik³

2021

J. Radiol. Prot.

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Many laboratories around the world work on the issue of protection against ionising radiation. It is a very broad topic, covering both the protection of members of the public and workers exposed to ionising radiation, based on personal or environmental monitoring. Thermoluminescence detectors are commonly used for this purpose, which is accepted in most countries. The entire process of dose evaluation with such dosimeters can be divided into several steps. Undoubtedly, one of the most important steps is the calibration procedure. The calibration should be performed in conditions as similar as possible to those experienced during the exposure. Moreover, the calibration is performed using only the Cs-137 source. This article presents results of Panasonic UD-802 irradiation dosimeters in different radiation fields generated by Cs-137, Kr-85, Sr-90/Y-90 and an x-ray tube, series N, and at different angles such as 0°, 30°, 60°, 90°. On the basis of the obtained results, the calibration coefficients and correction factors were determined in relation to calibration based on Cs-137 or Sr-90/Y-90 irradiated at 0°.

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Energy and angular dependence of the personal dosemeter in use at ITN-DPRSN

Cited by 7 publications

References 6 publications

The use of needle holders in CTF guided biopsies as a dose reduction tool

The use of needle holders in CTF guided biopsies as a dose reduction tool

Gafchromic XR‐QA2 film as a complementary dosimeter for hand‐monitoring in CTF‐guided biopsies

The correction factors for UD802 dosimeters irradiated with different radiation energies and at different incidence angles

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