Table 4 Validation results of pure spiked samples of ⁴⁰K, ²⁴¹Am, and ⁹⁰Sr/⁹⁰Y standard solution.

M(²⁴¹Am)

0

2.05 ± 0.01

1.97 ± 0.02

− 3.9

–

 ≤ MDA = 7.62 E−03^c

–

M(⁹⁰Sr)

0

–

 ≤ MDA = 4.41 E−03^c

–

3.12 ± 0.01

3.10 ± 0.08

− 0.6

M(⁴⁰K)

139

–

 ≤ MDA = 4.60 E−03^c

–

2.11 ± 0.05

2.17 ± 0.06

2.8

L(²⁴¹Am)

0

(2.08 ± 0.01) E−01

(2.22 ± 0.05) E−01

6.7

–

 ≤ MDA = 6.99 E−03^c

–

L(⁹⁰Sr)

0

–

 ≤ MDA = 2.66 E−03^c

–

(3.22 ± 0.01) E−01

(3.35 ± 0.76) E−01

4.0

L(⁴⁰K)

14

–

 ≤ MDA = 2.58 E−03^c

–

(2.03 ± 0.05) E−01

(2.11 ± 0.67) E−01

3.9