Source of Support: None, Conflict of Interest: None
Accurate dose measurement of high energy photon beams is important in radiotherapy. Measurement of absorbed dose to water through ionization chamber is the most commonly used method for routine dose evaluation. The international Code of Practice, recommended by International Atomic Energy Agency is one of the widely used code for this purpose. Salient features of this code are given, with special reference to BARC make dosimeter, having a tufnol walled ion chamber. The recent observations made during the testing of this code at different laboratories are discussed. The status of dosimetry in India at primary, secondary and user levels is given. The results of TLD intercomparisons with various radiotherapy centres in the country are discussed.