[填空题]
In a certain town the average yearly ba26fegk- r3c/2 u 9 uai.:jxtuqo5js yvckground radiation consists ofwv lytkr5,q9s7 fx89l qmd/i; 21 mrad of X-rays,mq7tyq/kf5 r9 ld9x w8lsvi ; and $\gamma$ rays plus 3.0 mrad of particles having a QF of 10. How many rem will a person receive per year on the average?dose(rem) = $ \times 10^{-2}\ \text{rem/yr}$