Centre for Radiation, Chemical and Environmental Hazards Radiation Protection Division formerly the National Radiological Protection Board Comparison of.

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Presentation transcript:

Centre for Radiation, Chemical and Environmental Hazards Radiation Protection Division formerly the National Radiological Protection Board Comparison of the energy response of the Mini 900 D and Mini 900 D H*(10) with different caps 17th May 2006

© HPA Centre for Radiation, Chemical and Environmental Hazards - Radiation Protection Division. Formerly the National Radiological Protection Board Introduction Both models of the 900 D have an end cap which is an essential part of the compensation ‘Exposure’ based model- Plastic H*(10) Model- Plastic + Aluminium Problem: common for the users of these instruments to :- - Have both generations of D - Remove/loose the caps and/or - Use the wrong cap (transpose between models)

© HPA Centre for Radiation, Chemical and Environmental Hazards - Radiation Protection Division. Formerly the National Radiological Protection Board The two compensation designs

© HPA Centre for Radiation, Chemical and Environmental Hazards - Radiation Protection Division. Formerly the National Radiological Protection Board What effect do the caps have? To see what effect the caps have - measured the energy response of both an original (Exposure) Mini 900 D and a Mini 900 D H*(10) with: Plastic cap Plastic + Aluminium No cap using ISO 4037 X and gamma radiations with energies between 16.3keV and 1.25MeV.

© HPA Centre for Radiation, Chemical and Environmental Hazards - Radiation Protection Division. Formerly the National Radiological Protection Board Energy response of the Mini 900 D

© HPA Centre for Radiation, Chemical and Environmental Hazards - Radiation Protection Division. Formerly the National Radiological Protection Board Energy response of the Mini 900 D H*(10)

© HPA Centre for Radiation, Chemical and Environmental Hazards - Radiation Protection Division. Formerly the National Radiological Protection Board H*(10) D and exposure D with plastic + aluminium

© HPA Centre for Radiation, Chemical and Environmental Hazards - Radiation Protection Division. Formerly the National Radiological Protection Board Conclusions At higher energies, the caps have no significant effect on response A cap must be used with either version to prevent significant over response at low energies Satisfactory Ambient H*(10) energy response is obtained with either model, providing the H* (10) cap (plastic + Al) is fitted Scope for optimisation of the design