The primary parameters for test ing an individ ual monitoring system are stan dard deviation and the coefficient of variation. The International Electrotechnical Commission (IEC) standard 62387-1 rec om mends test ing the co ef fi cient of vari a tion of dosemeters for var i ous doses be cause the ac cept able co ef fi cient of vari a tion changes with the dose level. How ever, for dose quantity H_p(10), i. e. doses greater than 1.1 mSv, the ac cept able limit is 5 % and re mains un - changed up to the high est dose in the mea sur able range. This study was car ried out to con firm whether the same is fol lowed in the In dian per son nel mon i tor ing sys tem when mea sur ing H_p(10) and also in or der to study the vari a tion in the co ef fi cient of vari a tion with a given dose. It was ob served that even if the co ef fi cient of vari a tion at doses be tween 0.1 mSv and 1.1 mSv is lower than the IEC re quire ment, at higher doses, the same may not be true. In rou tine mon - i tor ing, since the an tic i pated doses are less than 1 mSv, a mon i tor ing sys tem which per forms better than the IEC re quire ment at these lev els of doses is an ad van tage. How ever, good performance at said dose levels does not natu rally in di cate good per for mance at higher doses.