Estimated W-values for negative pions in nitrogen and argon
Turner, J.E.; Wright, H.A.; Hamm, R.N.
Health Physics 29(5): 792-794
1975
ISSN/ISBN: 0017-9078 PMID: 1193897 Document Number: 93193
The average energy required to produce an ion pair [W-value] was calculated for Nz and Ar as functions of their initial velocity. Since pion dosimetry is increasingly important to radiobiology and radiotherapy, the study examines the W-value for the ions produced when stopped negative pions are absorbed by atomic nuclei. The energy dependence of W amounts to 0.1% in measuring the dose delivered in tissue by stopped pions. Calculations imply that W changes by only 1% between plateau and peak regions.
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