Critical Assessment of Calibration Techniques for Low Pressure Proportional Counters Used in Radiation Dosimetry

Pihet, P.; Gerdung, S.; Grillmaier, R.; Kunz, A.; Menzel, H-G.

doi:10.1093/rpd/44.1-4.115

Cited by 8 publications

(9 citation statements)

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“…Assuming a worst case scenario in which the A-150 plastic shrinks by a 1% ͑a possibility reported in the literature 29 ͒ during the use of the counters, a 3.4% uncertainty is estimated for the sensitive volume, and is conservatively assigned to the measurement of the absorbed dose. This value is the consistent with the 4% value used by Pihet et al 22 in their assessment of uncertainties is dose measurements using proportional counters.…”

Section: Estimation Of Uncertaintiessupporting

confidence: 90%

“…Pihet et al estimate an uncertainty of 2% associated with the estimation of the proton edge using the above procedure, which was adopted for all the measurements in this work. 22 The counters were filled and operated according to standard procedures. 23 The lineal energy spectrum of the absorbed dose in each counter was simultaneously measured over the range from ϳ0.6 keV/m to ϳ1400.0 keV/m in three parts using standard electronics and data acquisition system and stored in a file for further analysis.…”

Section: A Counters Operationmentioning

confidence: 99%

“…The value of the lineal energy used for the protons at the edge has an uncertainty of 2%, arising from uncertainties in the stopping power data. 22 The residual uncertainty in the different dose components due to w value differences, after the w-value corrections have been made is assumed to be negligible and is ignored. The uncertainty associated with the gain drift of the counters was measured to be about 2%.…”

Section: Estimation Of Uncertaintiesmentioning

confidence: 99%

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Use of low‐pressure tissue equivalent proportional counters for the dosimetry of neutron beams used in BNCT and BNCEFNT

Kota¹,

Maughan²,

Tattam³

et al. 2000

Medical Physics

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The absorbed dose in a phantom or patient in boron neutron capture therapy (BNCT) and boron neutron capture enhanced fast neutron therapy (BNCEFNT) is deposited by gamma rays, neutrons of a range of energies and the 10B reaction products. These dose components are commonly measured with paired (TE/Mg) ion chambers and foil activation technique. In the present work, we have investigated the use of paired tissue equivalent (TE) and TE+ l0B proportional counters as an alternate and complementary dosimetry technique for use in these neutron beams. We first describe various aspects of counter operation, uncertainties in dose measurement, and interpretation of the data. We then present measurements made in the following radiation fields: An epithermal beam at the University of Birmingham in the United Kingdom, a d(48.5) + Be fast neutron therapy beam at Harper Hospital in Detroit, and a 252Cf radiation field. In the epithermal beam, our measured gamma and neutron dose rates compare very well with the values calculated using Monte Carlo methods. The measured 10B dose rates show a systematic difference of approximately 35% when compared to the calculations. The measured neutron+gamma dose rates in the fast neutron beam are in good agreement with those measured using a calibrated A-150 TEP (tissue equivalent plastic) ion chamber. The measured 10B dose rates compare very well with those measured using other methods. In the 252Cf radiation field, the measured dose rates for all three components agree well with other Monte Carlo calculations and measurements. Based on these results, we conclude that the paired low-pressure proportional counters can be used to establish an independent technique of dose measurement in these radiation fields.

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Section: Estimation Of Uncertaintiessupporting

confidence: 90%

Section: A Counters Operationmentioning

confidence: 99%

Section: Estimation Of Uncertaintiesmentioning

confidence: 99%

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Use of low‐pressure tissue equivalent proportional counters for the dosimetry of neutron beams used in BNCT and BNCEFNT

Kota¹,

Maughan²,

Tattam³

et al. 2000

Medical Physics

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“…Therefore, the resulting lineal energy calibrated by the a particles was multiplied by a factor of 0.964 in this study. 19 Finally an error (1 SD) of approximately 3.5% in the y D value was obtained by using the law of propagation of errors. Furthermore, the test pulses from a pulse generator (448, ORTEC) were sent to the preamplifier to confirm the linearity of the output from the electronics.…”

Section: Iia Electronics and Experimental Techniquementioning

confidence: 99%

Microdosimetric study on influence of low energy photons on relative biological effectiveness under therapeutic conditions using 6 MV linac

et al. 2011

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“…67 Kliauga has estimated an uncertainty of 2-3 % in the determination of the proton edge. 67 Thorough reviews of the calibration process and its associated uncertainties have been presented by Pihet 68 and Dietze. 69…”

Section: Counter Calibrationmentioning

confidence: 99%

Miniature tissue‐equivalent proportional counters for BNCT and BNCEFNT dosimetry

et al. 2001

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A dual miniature tissue-equivalent proportional counter (TEPC) system has been developed to facilitate microdosimetry for Boron Neutron Capture Therapy (BNCT). This system has been designed specifically to allow the analysis of the single event charged particle spectrum in phantom in high intensity BNCT beams and to provide this microdosimetric information with excellent spatial resolution. Paired A-150 and 10B-loaded A-150 TEPCs with 12.3 mm3 collecting volumes have been constructed. These TEPCs allow more accurate neutron dosimetry than current techniques, offer a direct measure of the boron neutron capture dose, and provide a framework for predicting the biological effectiveness of the absorbed dose. Design aspects and characterization of these detectors are reviewed, along with an exposition of the advantages of microdosimetry using these detectors over conventional dosimetry methods. In addition, the utility of this technique for boron neutron capture enhancement of fast neutron therapy (BNCEFNT) is discussed.

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Critical Assessment of Calibration Techniques for Low Pressure Proportional Counters Used in Radiation Dosimetry

Cited by 8 publications

References 0 publications

Use of low‐pressure tissue equivalent proportional counters for the dosimetry of neutron beams used in BNCT and BNCEFNT

Use of low‐pressure tissue equivalent proportional counters for the dosimetry of neutron beams used in BNCT and BNCEFNT

Microdosimetric study on influence of low energy photons on relative biological effectiveness under therapeutic conditions using 6 MV linac

Miniature tissue‐equivalent proportional counters for BNCT and BNCEFNT dosimetry

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