Classical radionuclidic calorimetry

Collé, R.

doi:10.1088/0026-1394/44/4/s15

Cited by 15 publications

(6 citation statements)

References 46 publications

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“…2 Collé and Zimmerman 3 reported uncertainties on the order of 0.8 µW, which is larger than the source strengths measured in this T VII. Uncertainty in EP Sk for the model 6711.…”

Section: E Emitted Power Measurementsmentioning

confidence: 55%

“…While no direct comparisons can be made between the measured EP of this work and the measured CP of prior works, the calorimeter measurements presented in this work were more accurate and had a lower uncertainty than those presented in the work of Collé and Zimmerman 3 and Collé. 2 Collé and Zimmerman 3 reported uncertainties on the order of 0.8 µW, which is larger than the source strengths measured in this T VII. Uncertainty in EP Sk for the model 6711.…”

Section: E Emitted Power Measurementsmentioning

confidence: 55%

“…CP and activity, A, are related by CP =Ē · A, whereĒ is the average energy per decay of the radionuclide. 2 For this reason, CP measurements can be used for absolute determinations of activity without requiring acid digestion of the source. 3 Additionally, the ratio of EP to CP is a measure of the amount of decay energy attenuated by the encapsulation of the source.…”

Section: Introductionmentioning

confidence: 99%

“…3 They reported an uncertainty of approximately 0.75 µW for 25 µW sources. Collé also reported results from a second, quasi-isothermal calorimeter operating around 303 K. 2 The reported stability of this calorimeter was on the order of 0.2 µW with occasional, unanticipated thermal drifts of up to 1 µW. Stump et al designed an isothermal calorimeter that operated at liquid nitrogen temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Absolute measurement of LDR brachytherapy source emitted power: Instrument design and initial measurements

2016

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Purpose: Energy-based source strength metrics may find use with model-based dose calculation algorithms, but no instruments exist that can measure the energy emitted from low-dose rate (LDR) sources. This work developed a calorimetric technique for measuring the power emitted from encapsulated low-dose rate, photon-emitting brachytherapy sources. This quantity is called emitted power (EP). The measurement methodology, instrument design and performance, and EP measurements made with the calorimeter are presented in this work. Methods: A calorimeter operating with a liquid helium thermal sink was developed to measure EP from LDR brachytherapy sources. The calorimeter employed an electrical substitution technique to determine the power emitted from the source. The calorimeter's performance and thermal system were characterized. EP measurements were made using four 125 I sources with air-kerma strengths ranging from 2.3 to 5.6 U and corresponding EPs of 0.39-0.79 µW, respectively. Three Best Medical 2301 sources and one Oncura 6711 source were measured. EP was also computed by converting measured air-kerma strengths to EPs through Monte Carlo-derived conversion factors. The measured EP and derived EPs were compared to determine the accuracy of the calorimeter measurement technique. Results: The calorimeter had a noise floor of 1-3 nW and a repeatability of 30-60 nW. The calorimeter was stable to within 5 nW over a 12 h measurement window. All measured values agreed with derived EPs to within 10%, with three of the four sources agreeing to within 4%. Calorimeter measurements had uncertainties ranging from 2.6% to 4.5% at the k = 1 level. The values of the derived EPs had uncertainties ranging from 2.9% to 3.6% at the k = 1 level.

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Section: E Emitted Power Measurementsmentioning

confidence: 55%

Section: E Emitted Power Measurementsmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Absolute measurement of LDR brachytherapy source emitted power: Instrument design and initial measurements

2016

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“…Since such spectra are extremely important for radionuclide metrology, e.g., when using liquid scintillation counting (see, e.g., Kossert and Mougeot, 2015), Čerenkov counting Kossert et al, 2014) or classical microcalorimetry (Collé, 2007), further beta spectra were measured within the scope of the EMPIR project MetroBeta (Loidl et al, 2019;Loidl et al, 2020). The measurement data obtained during this project for 151 Sm are scrutinized in this work with the aim of determining the maximum beta energy and comparing the beta spectrum with state-of-the art theoretical calculations.…”

Section: Introductionmentioning

confidence: 99%