The radionuclide monitoring system of the Comprehensive Nuclear-Test-Ban Treaty Organisation : from sample to product

ANNEX: An example of a Reviewed Radioactivity Report

ATMOSPHERIC RADIONUCLIDE MEASUREMENT REPORT

SAMPLE INFORMATION

Station ID: NZP47 Detector ID: N7P47 001

Station Type: Detector Type: HPGe

Station Location: Kaitala, New Zealand

Detector Description: Detector in Christchurch (Kaitala South)

Sample ID: 0014339 Sample Geometry: DISC70MMXS

Sample Ouantitty: 19720.00 m³ Sample Type: Particulate

Collection Start: 2000/12/30 20:22 Sampling Time: 23.90 hours

Collection Stop: 2000/12/31 20:16 Decay Time 24.60 hours

Acquisition Start: 2001/01/01 20:51 Acquisition Time: 23.34 hours

Acquisition Stop: 2001/01/02 20:11 Avg Flow Rate: 825.10 m3/hr

Collection Station Comments:

FilterMngr.exe Version 2.7.0.1 at 2001/01/02 20:11:59.040 UTC 2001/01/01

IDC Analysis General Comments:

Analysis 2001/01/02 20:13:48

MEASUREMENT CATEGORIZATION

Categorization Legend: Level 1 = Typical Background Rad. Meas.; Level 2 = Anomalous Background Rad. Meas.: Level 3 = Typical Anthropogenic Rad. Meas.; Level 4 = Anomalous Anthropogenic Rad. Meas.: Level 5 = Mult. Abnormal Anthropogenic Rad. Meas. Spectrum Category: (1) Typical Background Rad. Meas.

ACTIVITY SUMMARY

NATURAL RADIOACTIVITY:

Nuclides Identified and not Quantified: BI-212, K-40, NA-22, TL-208

Nuclides Quantified:

Nuclide Half-Life Conc(μBq/m³) %RelErr

BE-7 53.3 D 3.3E + 03 4.69

PB-212 10.64 H 3.3E + 03 5.48

ACTIVATION-PRODUCT RADIOACTIVITY None Found

FISSION-PRODUCT RADIOACTIVITY None Found

MINIMUM DETECTABLE CONCENTRATION FOR KEY NUCLIDES

Nuclide Half-Life MDC(μBq/m³)

BA-140 12.75 D 5.33

CE-143 1.4 D 8.21

CS-134 2.06135 Y 1.37

CS-136 13.16 D 1.71

CS-137 30.0197 Y 1.57

I-131 8.04 D 1.58

I-133 20.8 H 6.05

MO-99 65.94 H 19.34

NB-95 35.15 D 1.66

RU-103 39.28 D 1.22

TE-132 78.2 H 1.64

ZR-95 64.02 D 2.66

ZR-97 17 H 10.24

PEAK SEARCH RESULTS

27 peaks found in spectrum by automated peak search.

24 peaks associated with nuclides by automated processing.

3 peaks not associated with nuclides by automated processing.

89 percent of peaks were associated with nuclides.

Note: * indigates that a peak was a component of a multiplet.

PROCESSING PARAMETERS

Threshold: 3

Peak Start (keV): 42

Peak End (keV): 3000

Left FWHM limit: 2

Right FWHM limit: 2

Multiplet FWHM limit: 5

Fit Singlets: On

Critical-level Test: On

Estimate Peak Widths: On

Baseline Type: STEP

Baseline Channels: 3

Perform Subtraction: Off

Energy Tolerance: 0.75

Confidence Threshold: 0.25

DATAQUALITY FLAGS

Name Pass/Fail Value Test

FlowRate PASS 825.105 >500

Ba140 MDC PASS 5.32725 <30

Be7 FWHM PASS 1.09042 <1.7

K40 Location Difference PASS 0.666016 < 3*std deviation

Normalized Gain Difference PASS 7.27177e-06 < 0.0001

EVENT SCREENING FLAGS

Activation Products present in this spectrum No

Only one fission product in spectrum No

2 or more fission products in spectrum No

Cs-l37 present in spectrum No

UPDATE PARAMETERS

Use MRP: Yes

Most Recent Prior sample: Used

Gain Shift (%): 0.1

Zero Shift (Channels): 0.5

Minumum Area: 100

Use Weights: On

Allow Multiplets: On

Force Linear: Off

Lookup Tol Floor (keV): 0.2

Default RER Intercept: 0.5

Default RER Slope: 0.035

Default ECR Slope: 0.366211

Do RER Update: Yes

CALIBRATION EQUATIONS

Energy vs. Channel

E(c) = –0.1357 + 0.3286*c + 1.045E-07*c2 – 6.501E – 12*c³

E = energy (keV); c = channel number

Resolution vs. Energy

FWHM(E) = 0.26 + 0.03928*SQRT(E)

FWHM = Full Width Half Max (keV): E = energy (keV)

Efficiency vs. Energy

L(E) = In(941.3/E)

e(E) exp{–3.393 + 1.233*L – 0.09379*L² – 0.1966’L³ + 0.1366’L⁴ – 0.02683*L⁵

e = efficiency (counts/gamma); E = energy (keV)

SPECTRAL-REGION-OF-INTEREST (SROI) EDITING

PEAKS ADDET: none

PEAKS DELETED: none

SROIs MODIFIED: none

Nuclide ID Changes:

Average Concentration Differences: none

Nuclides Entering: none

Nuclides Leaving: none