1. IRMF/IPEM Diagnostic X-ray Intercomparison Jan 2007 - Participants: Hospital Medical Physicists/Clinical Scientists QA Radiographers

2. Standard X-ray beams….. IEC 61267 Medical diagnostic x-ray equipment – radiation conditions for use in the determination of characteristics  Uniform sets of radiation conditions RQR: Radiation beam emerging from x-ray set RQA: Radiation beam emerging from patient RQR-M Mammography x-ray beams

3. Compare beams? IEC 61267 IEC refkVHVL (mmAl) RQR570kV2.58 RQR81003.97 RQC5 (RQA) 701.5mm Cu Hospital Dept kVHVL (mmAl) 70 (+/- ?) ~3 100~3-4 70Add1.5mmCu

4. Equipment Tertiary standard (loaned by RRPPS): Keithley 15cc & 150cc ion chambers Likely equipment used by participants: ion chambers semiconductor photo diode (Pb backing) in combination with kV measuring capabilities (multimeter)

5. Results? Traceability? Ion chamber v photodiode? Estimation of uncertainty? Effects of generator/waveform? energy response?