Air density dependence of the soft X-ray PTW 34013 ionization chamber.

Purpose: We studied the dependence on air density of the response of the PTW 34013 ionization chamber, recently upgraded for dosimetry control of low energy X-ray beams.

Methods: Measurements were performed by changing the pressure conditions inside a pressure chamber. The behavior of the measurements against the air density inside this chamber was analyzed.

Characterization of the PTW SourceCheck ionization chamber with the Valencia lodgment for (125)I seed verification.

In brachytherapy using (125)I seed implants, a verification of the air kerma strength of the sources used is required. Typically, between 40 and 100 seeds are implanted. Checking all of them is unaffordable, especially when seeds are disposed in sterile cartridges.