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【单选题】
下列关于辐射环境监测的实验室测量分析的放射性测量说法错误的是()。A.
应采用本底、样品、本底，或本底、标准源、样品的程序交替进行
B.
在用α谱仪时，应定期用标准源进行仪器稳定性检验
C.
在用液体闪烁计数器测低能β时，必须注意猝灭校正
D.
对热剂量片测量时，须按环境热剂量计技术标准进行
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