Citation:

PANGAEA.951145

Name: Distribution of radioisotopes in polymetallic nodules from the CCZ collected during SONNE cruise SO239
Published: 2022-11-21
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Clarion Clipperton Fracture Zone; isotope data; polymetallic nodules; Radioactivity

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Published: 2022-11-21 • DOI registered: 2023-01-03

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Abstract:

This dataset comprises gamma spectrometric measurements of radioisotopes in samples from polymetallic nodules, which were collected in the framework of the European collaborative JPI Oceans MiningImpact project onboard R/V SONNE cruise SO239 in 2015. Samples were taken from different parts of the nodules (topside surface (s), bottom surface (b), interior (i)). The gamma radiation was measured in a Canberra well-type HPGe detector. Emission lines at 46 keV (Pb-210), 63 keV (U-234 via Th-234), 67 keV (Th-230), 186 keV (Ra-226 in absence of U-235 interference), 295 keV (Ra-226 via Rn-222) and 402 keV (Pa-231 via Rn-219 with some uncertainty on the intermediate Pa-231/Ac-227 equilibrium) were evaluated. The diluted uranium ore standard RGU-1 and the uranium ore standard UREM-11 served as calibration and reference, respectively.

Keyword(s):

Clarion Clipperton Fracture Zone; isotope data; polymetallic nodules; Radioactivity

Supplement to:

Volz, Jessica B; Geibert, Walter; Koehler, Dennis; Rutgers van der Loeff, Michiel M; Kasten, Sabine (2023): Alpha radiation from polymetallic nodules and potential health risks from deep-sea mining. Scientific Reports, 13(1), 7985, https://doi.org/10.1038/s41598-023-33971-w

Project(s):

JPI Oceans - Ecological Aspects of Deep-Sea Mining (JPIO-MiningImpact)

Marine Geochemistry @ AWI (AWI_MarGeoChem)

Funding:

Federal Ministry of Education and Research (BMBF), grant/award no. 03F0812F : JPI-O MiningImpact: Auswirkungen von Manganknollenbergbau auf biogeochemische Prozesse und die Ausbreitung von Stoffen in der Tiefsee

Coverage:

Median Latitude: 13.916668 * Median Longitude: -123.792066 * South-bound Latitude: 11.079000 * West-bound Longitude: -130.136330 * North-bound Latitude: 18.795830 * East-bound Longitude: -117.550330

Date/Time Start: 2015-03-29T04:18:00 * Date/Time End: 2015-04-21T20:08:00

Minimum Elevation: -4936.4 m * Maximum Elevation: -4324.5 m

Event(s):

SO239_60-1 (BC9) * Latitude: 11.807670 * Longitude: -117.550330 * Date/Time: 2015-03-29T04:18:00 * Elevation: -4324.5 m * Location: North Pacific Ocean * Campaign: * Basis: * Method/Device: Box corer (BC) * Comment: German BGR

SO239_88-1 * Latitude: 11.079000 * Longitude: -119.658830 * Date/Time: 2015-04-02T19:42:00 * Elevation: -4432.9 m * Location: North Pacific Ocean * Campaign: * Basis: * Method/Device: Box corer (BC) * Comment: IOM Joint Org.

SO239_119-1 (BC20) * Latitude: 13.859170 * Longitude: -123.252670 * Date/Time: 2015-04-08T08:06:00 * Elevation: -4516.2 m * Location: North Pacific Ocean * Campaign: * Basis: * Method/Device: Box corer (BC) * Comment: Belgian GSR

Comment:

RGU-1 (400 ppm U) was used for calibration. Except for U (186 keV!), activities are very similar to nodules.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Event label	Event		Volz, Jessica B
2	Sample code/label	Sample label		Volz, Jessica B
3	Depth, top/min	Depth top	m	Volz, Jessica B
4	Depth, bottom/max	Depth bot	m	Volz, Jessica B
5	Sample type	Samp type		Volz, Jessica B	nodule
6	Sample mass	Samp m	g	Volz, Jessica B
7	Time in seconds	Time sec	s	Volz, Jessica B	Counting time
8	Lead-210	210Pb	dpm/g	Volz, Jessica B	46 keV
9	Lead-210, error	210Pb e	±	Volz, Jessica B	1 s error (only counting, absolute units)
10	Uranium-234	234U	dpm/g	Volz, Jessica B	via 234Th (63 keV)
11	Uranium-234, error	234U e	±	Volz, Jessica B	1 s error (only counting, absolute units)
12	Thorium-230	230Th	dpm/g	Volz, Jessica B	67 keV; Unfortunate, probably random peak deconvolution for 230Th (see measured vs. expected value for UREM-11)
13	Thorium-230, error	230Th e	±	Volz, Jessica B	1 s error (only counting, absolute units)
14	Radium-226	226Ra	dpm/g	Volz, Jessica B	186 keV; For RGU-1 and UREM-11, this gamma line has a 235U interference (see measured vs. expected value for UREM-11) but not for the nodules. Good correlation of 226Ra (direct) vs. 226Ra (via 222Rn) for nodules, but precision is only 70%
15	Radium-226, error	226Ra e	±	Volz, Jessica B	1 s error (only counting, absolute units)
16	Radium-226	226Ra	dpm/g	Volz, Jessica B	via 222Rn (295 keV); Best value for 226Ra
17	Radium-226, error	226Ra e	±	Volz, Jessica B	1 s error (only counting, absolute units)
18	Radon-222	222Rn	dpm/g	Volz, Jessica B	351 keV; values with #: 2 peaks manually added
19	Radon-222, error	222Rn e	±	Volz, Jessica B	1 s error (only counting, absolute units)
20	Protactinium-231	231Pa	dpm/g	Volz, Jessica B	227Ac, 219Rn 6.7% (402 keV); Gamma line for 231Pa chosen based on Geibert, W. (2001): Actinium-227 als Tracer für Advektion und Mischung in der Tiefsee , PhD thesis, Universität Bremen. Some uncertainty on the intermediate 231Pa/227Ac equilibrium
21	Protactinium-231, error	231Pa e	±	Volz, Jessica B	1 s error (only counting, absolute units)
22	Radon-222	222Rn	dpm/g	Volz, Jessica B	609 keV
23	Radon-222, error	222Rn e	±	Volz, Jessica B	1 s error (only counting, absolute units)

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

440 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Event	2 Sample label	3 Depth top [m]	4 Depth bot [m]	5 Samp type (nodule)	6 Samp m [g]	7 Time sec [s] (Counting time)	8 210Pb [dpm/g] (46 keV)	9 210Pb e [±] (1 s error (only counting, abs...)	10 234U [dpm/g] (via 234Th (63 keV))	11 234U e [±] (1 s error (only counting, abs...)	12 230Th [dpm/g] (67 keV; Unfortunate, probably...)	13 230Th e [±] (1 s error (only counting, abs...)	14 226Ra [dpm/g] (186 keV; For RGU-1 and UREM-1...)	15 226Ra e [±] (1 s error (only counting, abs...)	16 226Ra [dpm/g] (via 222Rn (295 keV); Best val...)	17 226Ra e [±] (1 s error (only counting, abs...)	18 222Rn [dpm/g] (351 keV; values with #: 2 pea...)	19 222Rn e [±] (1 s error (only counting, abs...)	20 231Pa [dpm/g] (227Ac, 219Rn 6.7% (402 keV); ...)	21 231Pa e [±] (1 s error (only counting, abs...)	22 222Rn [dpm/g] (609 keV)	23 222Rn e [±] (1 s error (only counting, abs...)
	RGU-1 certified				0.891	279101.32	296.4		296.4		296.4		296.4		296.4		296.40		13.62		296.40
	UREM-11 [measured]				0.515	346994.53	42.7	0.8	43.4	0.8	31.4	1.9	47.2	0.8	42.1	0.5	42.70	0.40	2.00	0.2	44.37	0.71
	UREM-11 [expected]						43.6		43.6		43.6		43.6		43.6		43.60		2.00		43.60
SO239_60-1	SO239-60-1s	0	0.002	topside surface	0.733	260803.93	152.9	1.4			202.1	4.7	160.0		235.3	1.2	236.60		21.60	0.7	236.92
SO239_60-1	SO239-60-2s	0	0.002	topside surface	0.658	257877.42	111.2	1.3			117.4	3.8	178.4		250.7	1.3	247.90		16.60	0.6	252.97
SO239_88-1	SO239-88-1s	0	0.002	topside surface	0.602	242230.41	241.9	2.1			99.2	3.7	542.2		795.6	2.5	785.30		9.70	0.5	773.03
SO239_88-1	SO239-88-2s	0	0.002	topside surface	0.666	245089.40	168.6	1.6			84.2	3.3	400.4		584.4	2.0	582.70		4.40	0.3	593.53
SO239_119-1	SO239-119-1s	0	0.002	topside surface	0.710	269381.67	100.0	1.2	3.2	0.2	218.9	4.8	155.0		222.6	1.2	225.50		19.10	0.7	221.35
SO239_119-1	SO239-119-2s	0	0.002	topside surface	0.797	164698.77	142.2	1.7	4.8	0.3	220.2	5.9	134.1		182.4	1.3	187.30		19.40	0.8	182.08
SO239_180-1	SO239-180-1s	0	0.002	topside surface	0.768	177108.27	209.2	2.0	7.1	0.4	339.2	7.1	154.9		219.7	1.4	226.20		33.00	1.0	223.77
SO239_180-1	SO239-180-2s	0	0.002	topside surface	0.751	365003.47	182.8	1.3	6.3	0.2	346.3	5.1	157.5		227.6	1.0	244.60		24.30	0.6	233.94
SO239_195-1	SO239-195-1s	0	0.002	topside surface	0.736	253755.92	154.3	1.5	7.2	0.3	279.5	5.5	90.7		132.8	0.9	135.40		22.70	0.7	130.14
SO239_195-1	SO239-195-2s	0	0.002	topside surface	0.725	259694.65	134.7	1.4	4.9	0.3	430.9	6.8	148.1		222.4	1.2	225.10		32.50	0.9	224.25
SO239_60-1	SO239-60-1B	0	0.002	bottom surface	0.709	275707.67	125.2	1.3			63.4	2.6	209.9		302.5	1.3	301.70		2.30	0.2	302.11
SO239_60-1	SO239-60-2B	0	0.002	bottom surface	0.712	240219.20	170.8	1.6			128.0	3.9	300.9		451.0	1.7	453.50		2.20	0.2	449.74
SO239_88-1	SO239-88-1B	0	0.002	bottom surface	0.613	262286.82	161.5	1.6	2.5	0.2	81.3	3.2	266.0		367.1	1.6	375.30		6.30	0.4	362.07
SO239_88-1	SO239-88-2B	0	0.002	bottom surface	0.634	99431.16	187.5	2.8			157.1	7.1	300.9		441.0	2.8	459.70		9.00	0.8	435.93
SO239_119-1	SO239-119-1B	0	0.002	bottom surface	0.662	82873.13	199.1	3.0	8.7	0.6			307.8		444.4	3.1	452.70				450.28
SO239_119-1	SO239-119-2B	0	0.002	bottom surface	0.717	237463.61	174.9	1.6			63.9	2.8	273.9		383.6	1.6	381.70		2.20	0.2	378.94
SO239_180-1	SO239-180-1B	0	0.002	bottom surface	0.790	95756.42	233.6	2.8	4.1	0.4	61.6	4.1	270.8		394.0	2.5	390.00		3.30	0.4	389.98
SO239_180-1	SO239-180-2B	0	0.002	bottom surface	0.759	100705.02	198.5	2.6			33.1	3.0	289.1		394.9	2.4	#409.70		7.50	0.6	404.77
SO239_60-1	SO239-60-1i	0	0.002	interior	0.892	231673.89	14.6	0.4	2.8	0.2	24.2	1.5	6.7		10.3	0.2	9.50				9.20
SO239_88-1	SO239-88-1i	0	0.002	interior	0.703	446652.53	21.4	0.4	0.9	0.1	12.9	0.9	13.0		17.3	0.3	17.50				16.66
SO239_119-1	SO239-119-2i	0	0.002	interior	0.817	257061.68	12.0	0.4	2.2	0.2			6.9		9.1	0.2	9.90				9.65
SO239_180-1	SO239-180-2i	0	0.002	interior	0.929	236097.69	6.1	0.3	3.4	0.2			3.7		4.3	0.2	4.20				4.00
SO239_195-1	SO239-195-1i	0	0.002	interior	0.647	274030.88	16.1	0.5	4.2	0.2	3.0	0.6	8.9		8.7	0.2	8.10				8.89