{'fraction_non_alphanumeric': 0.04200542005420054, 'fraction_numerical': 0.028455284552845527, 'mean_word_length': 4.24113475177305, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
The biophysical properties of 3.9-GeV nitrogen ions. IV. OER and RBE determinations using cultured mammalian cells.

Chinese hamster cells cultured in vitro were used as a test system to determine the radiobiological properties of 3.9-GeV nitrogen ions. Samples were irradiated at the Bragg peak of the depth-dose distribution. The oxygen enhancement ratio (OER) was found to be 1.25 for nitrogen ions, compared with 2.2 for x-rays. The relative biological effectiveness (RBE) of the heavy ions is a function of dose and, therefore, of the level of biological damage. For a cell-surviving fraction of 10-2 the RBE is approximately 2. At lower doses of 50-100 rads, corresponding to a cell-surviving fraction of 0.5, the RBE is close to 6.