137Cs Radiological risk estimation of NSD facility at Karawang site by using RESRAD onsite application: effect of cover thickness

Abstract. The operational of near surface disposal facility during waste packages loading
activity into the facility, or in a monitoring activity around disposal facility at Karawang area
is predicted to give a radiological risk to radiation workers. The thickness of disposal facility
cover system affected the number of radiological risk of workers. Due to this reason, a
radiological risk estimation needs to be considered. RESRAD onsite code is applied for this
purpose by analyse the individual accepted dose and radiological risk data of radiation
workers. The obtained results and then are compared with radiation protection reference in
accordance with national regulation. In this case, the data from the experimental result of
Karawang clay as host of disposal facility such as Kd value of 137Cs was used. Results showed
that the thickness of the cover layer of disposal facility affected to the radiological risk which
accepted by workers in a near surface disposal facility.

Keywords: near surface disposal, 137Cs, cover system, Kd, radiological risk