It is often thought that used, old-style television picture tubes (cathode-ray tubes) are a waste material that contains toxic substances. But a new study suggests that this waste material may be useful. Researchers at 800 trillion becquerels of radioactivity Debris of the cathode ray tube glass was placed between the cobalt radiation source and the instrument for measuring the radiation dose to determine its ability to shield the radiation. The analysis results show that even if the glass debris of the cathode ray tube is not processed, the 55 cm thick Glass shards can reduce the radiation dose to 1% of the original, which is equivalent to the shielding ability of a lead plate about 9 cm thick, and lead is considered to be the substance that has the strongest ability to absorb and shield nuclear radiation so far. Debris and glass frit produced by crushing the cathode ray tube are mixed together, and the effect is about 40 cm thick. Regarding the glass debris of the cathode ray tube, the following statement is correct:. ['The ability to absorb nuclear radiation is comparable to lead.', 'Increasing thickness increases its ability to shield nuclear radiation.', 'Its view of containing toxic substances is questioned.', 'The fineness of its processing will affect the ability to shield nuclear radiation.']