Dosimetry protocol for absorbed dose to water using medical linear accelerator was published as JSMP guideline: a code of practice for dosimetry using a radiotherapy ionization chamber calibrated in a clinical linac (JSMP Linac Standard Dosimetry 24) in 2024. Formalism and implementation were simplified, and uncertainty of dose delivery was significantly reduced compared to currently prevailed dosimetry protocol of Standard Dosimetry 12 whose reference quality is 60Co gamma radiation. In this report outline and practice of JSMP Linac Standard Dosimetry 24 including comparison with Standard Dosimetry 12 was discussed.
