Occupationally exposed workers of category A are obliged to wear a personal dosemeter. This dosemeter should be designed to measure the operational quantity Hp(10) as an estimate of the effective dose E. These physical measurements are routine practice, but still have a lot of disadvantages, both from practical as from a metrological point of view. The results are mostly known only after some time with passive dosemeters, and wearing a dosemeter is often seen as a burden by some workers. Also the uncertainties with the present dosemeters (within a factor of 1.5 or 2 from the real value) are not negligeable.
Recent developments are moving towards active personal dosemeters, and even active systems that can transfer the dose data on-line to all kind of applications (i-Phones, servers, real-time monitoring panels,…). This would improve the application of the ALARA principle.
On the other hand, computational techniques are also evolving very fast. In the past standard mathemathical phantoms were used, while now very detailed voxel and NURBS phantoms are available. These NURBS phantoms can be designed in all kind of shapes and positions that represent much better the real individuals. On these NURBS phantoms it is feasible to do Monte Carlo simulations so that the personal doses from any radiation field can be calculated. With increasing computational power, such calculations go faster and faster.
The idea of this work is to develop an application in which, for a certain workplace field, the doses of the workers will be calculated instead of measured. For this the spatial radiation field, including energy and angular distribution, needs to be know. This can be incurred from on-line dose measurements on several locations. Input from fixed dose monitors can be used for this. The real movement of the persons would need to be monitored, and transferred to the calculation tool. In first instance, the calculations can be analytical, and in a later stage come from Monte Carlo calculations. The final goal would be to also use real individualised phantoms from the workers, so that also organ doses can be known.