**4. Recommendation and future perspective**

Due to high dose, the risks for the workers are considerable. In such circumstances we also consider that the clean-up process should be performed using robots [13] instead of the workers, according with the ALARA principle.

In order to avoid the dosimetrist and mechanical worker over exposure, prior decontamination, the sources located inside on the Hot Cell are extracted using a

**Figure 8.** *Robot for sorce removal.*

**Figure 9.** *Sources removal monitoring.*

**Figure 10.** *Outside decontaminat spraying.*

*Dose Rates Comparative Study for Workers Involved in the Hot-Cells Clean-Up Activities… DOI: http://dx.doi.org/10.5772/intechopen.99901*

remote-controlled car (see **Figure 8**). The process is monitored by the dosimetrist from distance using a portable digital survey meter [2], (see **Figure 9**).

The decontaminant gel should be also sprayed from distance by the worker located outside of the Hot Cell (see the **Figure 10**). Then the decontamination should be performed using a Schunk robotic arm mounted on a Neobotix Platform [13, 14].

## **5. Conclusions**

Dose rates received during a nuclear research reactor Hot Cells decontamination were assessed by a standard as well as a numerical method.

For both assessments resulted that the dose for professional exposed is higher than the limit. The risk is very high due to the fact that decontamination process was performed manually.

After three decontamination cycles, the radiation level remains significant because the stainless-steel lining is activated. The clean-up and decontamination should be performed by the robots in order to prevent workers over exposure.

The dose rates calculated with RESRAD Build code are lower and more accurately than the those obtained by standard method due to model complexity.

Despite small differences, it can conclude that both methodologies for dose assessment are in agreement and useful for similar exposure situations.

## **Acknowledgements**

The authors offer many thanks to Dr. A.O. Pavelescu for his suggestions and feedback when clarifications of issues were required and also to Mr. Adrian Zorliu for his support for samples sampling.

## **Author details**

Carmen Tuca\* and Ana Stochioiu "Horia Hulubei" National Institute for R&D in Physics and Nuclear Engineering, IFIN-HH, Magurele, Romania

\*Address all correspondence to: tuca@nipne.ro

© 2021 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
