Bestimmung des mittleren Energieaufwandes    <sub>L</sub> zur Bildung eines Ionenpaares in Luft für <sup>60</sup>Co-γ-Strahlung

Kunze, Rolf-Ulrich; Hecker, O.

doi:10.1080/10256018008544496

Cited by 2 publications

(4 citation statements)

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“…Wang for information regarding his work on the BIPM chamber (Wang and Rogers 2008b) and Ernesto Mainegra-Hing for his assistance with the German-language article of Kunze and Hecker (1980). where I is the ionization current, V is the cavity volume, ρ a is the air density and P represents the product of correction factors for the chamber.…”

Section: Discussionmentioning

confidence: 99%

“…The results of Reid and Johns (1961) have large uncertainties. There is insufficient information to calculate correction factors for the experiment of Kunze and Hecker (1980). Given these large uncertainties, it is unlikely that including these results in the present analysis would significantly affect the average value of (W/e) air ( LBIPM /ρ) C a calculated.…”

Section: Introductionmentioning

confidence: 95%

“…Boutillon and Perroche-Roux (1987) used the results of a number of other experiments measuring (W/e) air ( L /ρ) C a to calculate an average value of (W/e) air . These include experiments by Reid and Johns (1961), Bewley (1963), Petree and Lamperti (1967), Engelke and Hohlfeld (1971), Guiho and Simoen (1975) and Kunze and Hecker (1980). Though details differed, each experiment involved the comparison of ionometric and calorimetric measurements.…”

Section: Introductionmentioning

confidence: 99%

“…The experiments of Reid and Johns (1961) and Kunze and Hecker (1980) are omitted from this reanalysis. The results of Reid and Johns (1961) have large uncertainties.…”

Section: Introductionmentioning

confidence: 99%

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Re-evaluation of the product of (W/e)_airand the graphite to air stopping-power ratio for⁶⁰Co air kerma standards

Thomson

Rogers

2010

Phys. Med. Biol.

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Experiments which determine the product of (W/e)air, the average energy deposited per coulomb of charge of one sign released by an electron coming to rest in dry air, and (LDelta/rho)Ca, the Spencer-Attix mean restricted mass collision stopping-power ratio for graphite to air, in a 60Co or 137Cs beam are reanalysed. Correction factors, e.g., to account for gaps about a calorimeter core or perturbations due to a cavity's presence, are calculated using the EGSnrc Monte Carlo code system and these generally decrease the value of (W/e)air(LDelta/rho)Ca for each experiment. Stopping-power ratios are calculated for different choices of density correction and average excitation energy (I-value) for graphite. To calculate an average value (W/e)air(LBIPM/rho)Ca for the BIPM air kerma standard, each experimental result is multiplied by the ratio (LBIPM/rho)Ca/(LDelta/Rho)Ca. While individual values of (LDelta/rho)Ca are sensitive to the I-values and density corrections assumed, this ratio varies by less than 0.1% for different choices. Hence, the product (W/e)air(LBIPM/rho)Ca is relatively insensitive to these choices. The weighted mean of the updated data is (W/e)air(LBIPM/rho)Ca=33.68 J C(-1)+/-0.2%, suggesting that the accepted value of 33.97 J C(-1)+/-0.1% is 0.8% too high. This has implications for primary 60Co air kerma standards worldwide and potentially for the choice of graphite I-value and density correction for the calculation of the graphite stopping power, as well as the value of (W/e)air.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

“…The experiments of Reid and Johns (1961) and Kunze and Hecker (1980) are omitted from this reanalysis. The results of Reid and Johns (1961) have large uncertainties.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Re-evaluation of the product of (W/e)_airand the graphite to air stopping-power ratio for⁶⁰Co air kerma standards

Thomson

Rogers

2010

Phys. Med. Biol.

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Re-evaluation of the W value for electrons in dry air

Boutillon¹,

Perroche-Roux²

1987

Phys. Med. Biol.

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Bestimmung des mittleren Energieaufwandes _L zur Bildung eines Ionenpaares in Luft für ⁶⁰Co-γ-Strahlung

Cited by 2 publications

References 3 publications

Re-evaluation of the product of (W/e)_airand the graphite to air stopping-power ratio for⁶⁰Co air kerma standards

Re-evaluation of the product of (W/e)_airand the graphite to air stopping-power ratio for⁶⁰Co air kerma standards

Re-evaluation of the W value for electrons in dry air

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Bestimmung des mittleren Energieaufwandes L zur Bildung eines Ionenpaares in Luft für 60Co-γ-Strahlung

Cited by 2 publications

References 3 publications

Re-evaluation of the product of (W/e)airand the graphite to air stopping-power ratio for60Co air kerma standards

Re-evaluation of the product of (W/e)airand the graphite to air stopping-power ratio for60Co air kerma standards

Re-evaluation of the W value for electrons in dry air

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Product

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Bestimmung des mittleren Energieaufwandes _L zur Bildung eines Ionenpaares in Luft für ⁶⁰Co-γ-Strahlung

Re-evaluation of the product of (W/e)_airand the graphite to air stopping-power ratio for⁶⁰Co air kerma standards

Re-evaluation of the product of (W/e)_airand the graphite to air stopping-power ratio for⁶⁰Co air kerma standards