ORCID Profile
0000-0002-8083-3111
Current Organisations
Museum of New Zealand Te Papa Tongarewa
,
Manaaki Whenua - Landcare Research
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Publisher: Wiley
Date: 05-1996
DOI: 10.1118/1.597702
Abstract: Radiotherapy x-ray and electron beam surface doses are accurately measurable by use of a MOS-FET detector system. The MOSFET (Metal Oxide Semiconductor Field Effect Transistor) is approximately 200-microns in diameter and consists of a 0.5-microns Al electrode on top of a 1-microns SiO2 and 300-microns Si substrate. Results for % surface dose were within +/- 2% compared to the Attix chamber and within +/- 3% of TLD extrapolation results for normally incident beams. Detectors were compared using different energies, field size, and beam modifying devices such as block trays and wedges. Percentage surface dose for 10 x 10-cm and 40 x 40-cm field size for 6-MV x rays at 100-cm SSD using the MOSFET were 16% and 42% of maximum, respectively. Factors such as its small size, immediate retrieval of results, high accuracy attainable from low applied doses, and as the MOSFET records its dose history make it a suitable in vivo dosimeter where surface and skin doses need to be determined. This can be achieved within part of the first fraction of dose (i.e., only 10 cGy is required.)
Publisher: Pensoft Publishers
Date: 30-11-2020
DOI: 10.3897/BDJ.8.E59472
Abstract: The introduction of species to new regions is occurring at an increasing rate. These introductions typically consist of species that are deliberately introduced for the purposes of biological control of pests or of species that are accidentally introduced through human-mediated transport networks. Understanding the potential and actual impacts of these introduced species requires comprehensive information on their geographic distributions and biological associations. However, apart from a few well-known case studies, such information is lacking for many introduced species which severely hinders further assessment of risks and impact. A dataset is provided on host associations, geographic distributions and dates of collection for both deliberately and accidentally-introduced parasitoid wasp species (Hymenoptera) in New Zealand. Information was obtained by digitising specimens from the New Zealand Arthropod Collection. Dates of records range from 1921 to 2017. The dataset includes 1265 specimen records, representing 127 parasitoid species from 12 families, with host records for 177 host species from 61 families and eight insect orders. These data provide baseline information to help evaluate the risk from introduced parasitoids to non-target and native species.
Publisher: Pensoft Publishers
Date: 15-06-2021
DOI: 10.3897/RIO.7.E69765
Abstract: The New Zealand Arthropod Collection (NZAC) is the world’s largest taxonomic collection of terrestrial invertebrates from New Zealand. The NZAC policy is presented that defines the vision for the collection of being managed to the highest international standards, connected through a global infrastructure, and providing high quality, authoritative, and trusted information. The policy also provides context and guidelines for collection activities, and twenty-two objectives are outlined that will be completed over the next 5 years.
No related grants have been discovered for Sarah Tassell.