Table 1 Results of replicate measurements of NIST SRM 987 in three different mass spectrometric sessions.

From: A part per trillion isotope ratio analysis of 90Sr/88Sr using energy-filtered thermal ionization mass spectrometry

Session

Reference date

88Sr (V)

90Sr1,2 (cps)

Average darknoise (cps)

90Sr/88Sr1,2 Abundance sensitivity

3SD detection limit

Number of analysis

Bremen

January 22nd, 2020

20.3

0.0118 (29)

0.0070

9.3 (3.0) × 10−12

3.7 × 10−12

4

Fukushima-1

April 3rd, 2021

27.2

0.0168 (34)

0.0125

1.0 (2.2) × 10−11

3.1 × 10−12

13

Fukushima-2

June 5th, 2021

26.3

0.0136 (29)

0.0096

8.3 (1.8) × 10−12

2.7 × 10−12

17

  1. 1Errors in the parenthesis are 2SD.
  2. 2These data are not corrected for SEM dark noise.
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