The measurement of penetrating and non-penetrating radiation from bare and shielded uranium

One of the difficulties of the routine personnel dosimetry is the measurement of the non-penetrating dose. In this work, the penetrating and non-penetrating radiation at different distances near natural uranium source was measured. The calibration factor for the non-penetrating dose was experimentally found. An expression is presented for the calculation of the fluence at different distances from a half infinite source, striking a TLD chip and the experimental results are compared to the calculated ones. The radiation field of the source shielded by aluminium and iron plates of different thickness, was also measured. (Author)