https://blog.gongquiz.com/2021/11/07/%eb%8f%99%ec%9c%84%ec%9b%90%ec%86%8cisotope%ec%99%80-%eb%8f%99%ec%a4%91%ec%9b%90%ec%86%8cisobar%ec%97%90-%eb%8c%80%ed%95%9c-%eb%8b%a4%ec%9d%8c-%ec%84%a4%eb%aa%85-%ec%a4%91-%eb%a7%9e%eb%8a%94/