Indico has been updated to v3.3. See our blog post for details on this release. (OTG0146394)

Jun 25 – 29, 2023
Ole-Johan Dahls Hus
Europe/Oslo timezone

Real-time Autoradiography on Environmental Samples with a Parallel Ionization Multiplier Gaseous Detector

Jun 28, 2023, 10:00 AM
Simula Auditorium (Ole-Johan Dahls Hus)

Simula Auditorium

Ole-Johan Dahls Hus

Oslo Science Park Gaustadalléen 23B, 0373 Oslo
Oral Applications Applications


Joyce W. L. Ang (University of Helsinki)


Autoradiography, an imaging technique providing high resolution two-dimensional images of radioactive emissions, serves as a critical tool in the detection and monitoring of radioactivity from various samples (e.g., radiopharmaceutical, geological, environmental, etc.). For example, during the Fukushima Daiichi Nuclear Power Plant accident, phosphor screen autoradiography was employed to locate and isolate radioactive particles from air filters and regional soil [1,2]. However, this current technique is laborious, prone to error (trial and error must be used for optimal measurements), and does not provide spectrometry data. As an improvement from phosphor screen autoradiography, we propose the use of a micro-pattern gas detector (MPGD) incorporating a parallel ionization multiplier [3] to perform real-time autoradiography in environmental samples.

Real-time autoradiography with a MPGD can provide an advancement in monitoring and detection of radioactivity in complex environmental samples. With its high sensitivity (0.0005 cpm/mm$^{2}$) and activity detection range (over 5 order of magnitudes), a MPGD is advantageous in differentiating hotspots from a sample with heterogeneously distributed radioactivity. In addition, a MPGD can provide potential identification of different alpha- and beta-emitting radionuclides via spectrometry. However, this technique requires ground-truthing to ensure sensible and reliable analysis of environmental samples. In this contribution, we explore the application of a MPGD in real-time autoradiography of environmental samples in terms of the spatial resolution, sample preparation, minimum detectable activity, spectrometric capabilities, and artefact contributions. Utilizing the results from Monte Carlo simulation with a GEANT4 toolkit and experimental data from the detector (when measuring radioactive Cs-134, Cs-137, and low enriched uranium), we demonstrate that real-time autoradiography using a MPGD can reliably provide results with good reproducibility.

[1] K Adachi et al., Sci. Rep. 3 (2013), 2554
[2] R Ikehara et al., Environ. Sci. Technol. 52 (2018), 6390–6398
[3] J Donnard et al., Nucl. Instrum. Methods Phys. Res., Sect. A 610 (2009), 158–160

Primary author

Joyce W. L. Ang (University of Helsinki)


Dr Arthur Bongrand (Nantes Université) Dr Samuel Duval (AI4R) Dr Jérôme Donnard (AI4R) Prof. Satoshi Utsunomiya (Kyushu University) Dr Risto Koivula (University of Helsinki) Dr Marja Siitari-Kauppi (University of Helsinki) Prof. Gareth T. W. Law (University of Helsinki)

Presentation materials