Search UK public tenders and contract notices
Official notices, one row per procedure. Filters use published facts only: delivery region from the notice, buyer type from the official classification, route and agreement type as published, never a Tenderline score.
Retenders uses the same keywords and compatible filters. Notice-only filters and CPV detail beyond the division do not carry over.
All records
Showing 1–50 · every procedure in the catalogue, any stage.
- Awarded · Competitive flexible procedureSME suitable
ID 6612871 - DAERA - AFBI - Comprehensive Radiological Monitoring Survey for Radionuclide Decommissioning Project
Agri-Food and Biosciences InstitutePublic Procurement Organisation · Central government · Northern Ireland
The Agri-Food and Biosciences Institute (AFBI) (Buyer) have a requirement for the provision of a Comprehensive Radiological Monitoring Survey and Report (Contract). AFBI has historically provided the radiological monitoring and emergency re…
Awarded to Aurora Health Physics Services Ltd
- Value
- £125k
- Term
- 6 months
- Submit via
- eTendersNIlogin required
- Published
- #06c59e
- AwardedDirect awardSME suitable
Replacement Radioactive Sources-UKHSA Instrument Testing Service (ITS)
Secretary of State for Health and Social Care acting as part of the Crown through UK Health Security Agency · Central government · Nationwide (UK)
Award of a three month contract (with an option to extend by up to six months) to High Technology Sources Limited for the supply of a suite of replacement radioactive sources required for use in its Instrument Testing Service facilities (IT…
Awarded to High Technology Sources Limited
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #05f6ad
- Awarded · Direct award
Brachytherapy (Low Dose)
University Hospitals Dorset NHS Foundation Trust · Central government · delivery region not published
Contract for Brachytherapy (Low Dose) with BD Limited at Poole Hospital within Radiotherapy. The price is inclusive of; Seeds, Consumables, Loan Equipment along with Preventative Maintenance, Laptop and access to Pro Brachy Patient Database…
Awarded to Becton, Dickinson U.K. Limited
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #06cef0
- Awarded · Competitive flexible procedureSME · VCSE suitable
Nuclear Safeguards Programme
Department for Energy Security & Net Zero · Central government · Nationwide (UK)
The Nuclear Safeguards Programme (NSP) provides international nuclear safeguards technical support to the International Atomic Energy Agency (IAEA) and the Department for Energy Security and Net Zero (DESNZ). Nuclear safeguards are technica…
Awarded to National Nuclear Laboratory · 2 awards
- Value
- £20m
- Term
- 3.5 yearsup to 6.5 years with extensions
- Submit via
- Jaggaerlogin required
- Published
- #051ceb
- Planned · tender expected Open procedureFramework
Radiopharmaceuticals and Related Consumables
Leeds and York Partnership NHS Foundation Trust · Central government · Nationwide (UK)
NHS North of England Commercial Procurement Collaborative on behalf of NHS Procurement in Partnership (Comprising of East of England NHS Collaborative Procurement hub, NHS Commercial Solutions, NHS London Procurement partnership and NHS Nor…
Likely replaces the contract held by GE Healthcare +2
- Value
- £70mceiling, not a contract size
- Term
- 4 years
- Submit via
- portal not identified
- Published
- #06e884
- Award pendingDirect awardSME · VCSE suitable
Provision of Rubidium 82 Generator
Manchester University NHS Foundation Trust · Central government · delivery region not published
Provision of Rubidium 82 generators to enable the production of Nuclear Medicine for Cardiac PET Imaging for MFT Patients.
Intended award to BRACCO UK LTD
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #0777aa
- Awarded · Below threshold - open competitionSME · VCSE suitable
Reporting UK Non-Nuclear Radioactive Discharges
Department for Energy Security & Net Zero · Central government · Nationwide (UK)
The Department for Energy Security and Net Zero is seeking a supplier to gather, analyse, verify, and report annual UK non‑nuclear radioactive discharge data, as required under the OSPAR Convention. This work supports the UK’s international…
Awarded to HEQLAS INTEGRATED SERVICES LTD
- Value
- £26k
- Term
- 3 yearsup to 4 years with extensions
- Submit via
- Jaggaerlogin required
- Published
- #06819d
- Planned · expected · not yet published
Tritium Storage Solutions Specification Definition and Market Research
UK Atomic Energy Authority · South East England
UKAEA requires a solution for storing relatively small amounts of tritium. Usually, we use getter materials such as depleted Uranium and products have been purchased previously from known suppliers. What has been delivered has not been of h…
- Value
- £60k
- Term
- 12 months
- Submit via
- portal not identified
- Published
- #06d330
- Planned · tender expected Dynamic purchasing systemSME · VCSE suitable
ENHT - Radiopharmaceuticals to support Nuclear Medicine services
East and North Hertfordshire Teaching NHS Trust · Central government · Nationwide (UK)
Supply of Radiopharmaceuticals to support Nuclear Medicine services
- Value
- Not published
- Term
- 5 years
- Submit via
- portal not identified
- Published
- #06bc45
- Planned
Soft Market Testing Radiopharmacy Services Joint Venture
Royal United Hospitals Bath NHS Foundation Trust · Central government · delivery region not published
The Royal United Hospitals NHS Foundation Trust is exploring options to expand its Radiopharmacy Services to improve access to diagnostics, innovative treatment and research in Southwest England. Uniquely positioned on the M4/M5 corridor, t…
- Value
- Not published
- Term
- 10.5 years
- Submit via
- portal not identified
- Published
- #06a701
- PlannedAward under framework
Provision of Radiopharmaceutical Products
United Lincolnshire Teaching Hospitals NHS Trust · Central government · East Midlands
Provision of radiopharmaceutical products for Nuclear Medicine and Radiotherapy.
- Value
- £2.7m
- Term
- 2 yearsup to 4 years with extensions
- Submit via
- portal not identified
- Published
- #069a0a
- AwardedAward procedure without prior publication of a call for competition
Hot Isostatic Pressing (HIP) of Plutonium Powders – Installation and commissioning of equipment in Central Laboratory
Nuclear Decommissioning Authority · Nationwide (UK)
This requirement is for the following: The development of incorporation of Plutonium powders using Hot Isostatic Pressing (HIP) technology. The powders are located at Sellafield Limited, and the NNL’s Central Laboratory facility on the site…
Awarded to National Nuclear Laboratory
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #03b2b4
- AwardedCompetitive procedure with negotiation
Small Modular Reactor Technology Partner
Great British Energy - Nuclear · Nationwide (UK)
The Government is committed to a programme of new nuclear projects beyond Sizewell C, giving industry and investors the confidence they need to deliver projects at speed. Great British Energy - Nuclear (GBE-N) was launched as part of the go…
Awarded to Rolls-Royce SMR Limited
- Value
- £20bn
- Term
- 15.5 years
- Submit via
- Jaggaerlogin required
- Published
- #03e2f8
- Awarded · Direct award
Provision of Radioactive Waste Management Services (AGR Unique Ref. 86 F/W)
Nuclear Restoration Services Limited · delivery region not published
Procurement record to allow the publication of UK5 Transparency Notice for the Contract being novated from EDF. The transparency notice Contract value is based on the maximum contract extension period, therefore not a guaranteed value of sp…
Awarded to Inutec Ltd T/A Tradebe Inutec
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #05db6a
- AwardedBelow threshold - without competitionDefence & security
Provision and Disposal of Neutron Source for Nuclear Department-CDN
Ministry of Defence · Central government · Nationwide (UK)
Provision of replacement neutron source and disposal of exsisting sources
Awarded to High Technology Sources Limited
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #068fec
- AwardedBelow threshold - without competition
Industrial Radiography Sources
Sellafield Limited · North West England
Supply and service high energy radiography sealed sources to support site operations.
Awarded to Gilligan Engineering Services
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #067605
- Award pending · decided Direct awardSME · VCSE suitable
PET-CT FDG tracers for Private patients
The Royal Marsden NHS Foundation Trust · Central government · Greater London
the supply of FDG tracers used for PET-CT's in privately funded patients and research.
Intended award to Siemens Healthcare Limited
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #064e18
- AwardedRestricted procedure
C14801 - Manufacture & Supply of SRP Products
Sellafield Limited · North West England
Sellafield, through the Manufacture and Supply of SRP Products Contract Opportunity has appointed a single supplier to manufacture SRP Products (as defined below) using Sellafield’s New Product Introduction (NPI) process. Further details re…
Awarded to LTi Metaltech Ltd
- Value
- £75m
- Term
- 14 years
- Submit via
- Atamis (Health Family)login required
- Published
- #042353
- AwardedDirect award
New Sources For RPI Equipment Maintenance
Sellafield Limited · North West England
Purchase of 42 radioactive sources for maintenance of RPI equipment and the delivery of these sources. Required due to expanding scope of work within RPI services teams and the team receiving the scope currently have no sources to carry out…
Awarded to HTSL
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #0604d4
- Awarded · Award under framework
Radiopharmaceutical Products
Royal Cornwall Hospitals NHS Trust · Central government · South West England
Supply of radiopharmaceutical products
Awarded to Curium Pharma, GE Healthcare
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #06066f
- Award pendingDirect awardFramework
Radiopharmaceutical Products
Royal Cornwall Hospitals NHS Trust · Central government · Nationwide (UK)
Supply of radiopharmaceutical products
Intended award to Curium Pharma, GE Healthcare · 2 awards
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #0605de
- Awarded · Open procedureFramework3 lotsSME suitable
Radiopharmaceutical Products
NHS Shared Business Services Limited · NHS & health · Nationwide (UK)
NHS Shared Business Services act in an Agency capacity for and on behalf of its customers (Approved Organisations) - existing and new. These comprise of NHS and Social Care organisations (whether acting individually, or on behalf of, or tog…
Awarded to ALLIANCE MEDICAL RADIOPHARMACY LIMITED, Curium Pharma, GE Healthcare +2 more · 3 awards
- Value
- £150mceiling, not a contract size
- Term
- 3 years
- Submit via
- SAP Aribalogin required
- Published
- #04f8cf
- AwardedOpen procedureFramework
Standalone agreement for the Supply of Rubidium-82 Generator Cart for Cardiac PET CT Imaging - BARTS HEALTH NHS TRUST
HealthTrust Europe LLP (HTE) acting on behalf of Mid and South Essex NHS Foundation Trust · NHS & health · Nationwide (UK)
The Tender is to establish a standalone agreement for the supply of a Rubidium-82 generator cart to enable the cardiac PET-CT service at Barts Health NHS Trust ("Agreement"). This is a radionuclide generator that produces and administers th…
Awarded to BRACCO UK LTD
- Value
- £7.5mceiling, not a contract size
- Term
- 3 years
- Submit via
- Jaggaerlogin required
- Published
- #04e36c
- Planned · expected · not yet publishedSME suitable
Provision of Instrument to Determine UF3 and UF4 Ratio in Molten Uranic Fuel Salt Matrices
NATIONAL NUCLEAR LABORATORY LIMITED · Nationwide (UK), North West England
UKNNL is in collaboration with Westinghouse on Springfields Fuels (SFL) site in the development and substantiation of a commercial scale process for the manufacture of fuel salt for the Integral Molten Salt Reactor (IMSR) for a client. As p…
- Value
- £150k
- Term
- 12 months
- Submit via
- portal not identified
- Published
- #05d2b2
- Award pendingDirect award
Radiopharmaceuticals supply (SRH, RSCH & PRH)
University Hospitals Sussex NHS Foundation Trust · Central government · South East England
Supply of radiopharmaceuticals for imaging (Nuclear Medicine directorate). The contracts will be for 12 months (backdated to 01.04.2025) with the option to extend up to an additional 12 months to allow for delays to MHRA approval.
Intended award to Medway NHS Foundation Trust, University Hospitals Southampton- Adanac Aseptics Hub · 2 awards
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #05d407
- AwardedRestricted procedure
C24615 - Early Legacy Boxes - Boxes & Lids
Sellafield Limited · North West England
This contract is only for suppliers eligible to tender via the Engineering and Technology Solutions Marketplace DPS Category, Lot 4 Manufacturing Solutions Category, sub-category: Manufactured Products.<br/><br/>This Procurement is for the …
Awarded to Bendall's Engineering Limited
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #05ced8
- AwardedRestricted procedure
C24612 - Early Legacy Boxes - Liner and AFP
Sellafield Limited · North West England
This contract is only for suppliers eligible to tender via the Engineering and Technology Solutions Marketplace DPS Category, Lot 4 Manufacturing Solutions Category, sub-category: Manufactured Products.<br/><br/>This Procurement is for the …
Awarded to Bendall's Engineering Limited
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #05ced7
- Planned · expected · not yet published
Radiopharmaceutical Manufacturing Unit
Guy's and St Thomas' NHS Foundation Trust · Central government · Greater London
GSTT is seeking to commission an industry partner to design, build and operate a new, purpose-built Good Manufacturing Practice (GMP)-compliant Radiopharmaceutical Manufacturing Unit to support the growing demand for diagnostic (SPECT and P…
- Value
- £69m
- Term
- 12 yearsup to 17 years with extensions
- Submit via
- portal not identified
- Published
- #058bd9
- Planned · expected · not yet published
Supply of Lutathera doses
Kettering General Hospital NHS Foundation Trust · Central government · Greater London
Supply of Lutathera doses for oncological treatment
- Value
- £2.4m
- Term
- 3 years
- Submit via
- portal not identified
- Published
- #0527c6
- AwardedBelow threshold - without competition
Replacement Radioactive sources for equipment
Medway NHS Foundation Trust · Central government · North East England, North West England, Yorkshire and the Humber, East Midlands, West Midlands, East of England
Replacement Radioactive sources for equipment/250016373 740 MBq, Rectangular, Active: 620 x 420 mm, Outer: 700 x 538 mm
Awarded to Mediso Medical Imaging Systems UK Limited
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #04ec9a
- AwardedOpen procedureFramework
Radioactive Materials and Associated Consumables
NHS Greater Glasgow and Clyde · NHS & health · Scotland
NHS Greater Glasgow and Clyde (NHSGGC) are tendering for Radiopharmaceuticals and associated products. NHS Greater Glasgow and Clyde (NHSGGC) is the largest of the fourteen territorial NHS Boards in Scotland. The radiopharmacy service provi…
Awarded to Adelphi Tubes, Curium Pharma, GE Healthcare +1 more
- Value
- £4.5mceiling, not a contract size
- Term
- 3 years
- Submit via
- Public Contracts Scotlandlogin required
- Published
- #04722f
- Closed Restricted procedure
H3AT - Water Detritiation System
United Kingdom Atomic Energy Authority · South East England
The Supply of a WDS equipment package to be supplied at UKAEA’s Culham Campus. The scope of work is expected to be delivered, installed, and commissioned within an estimated duration of 36 months. The scope of the Assemblies includes final …
- Value
- £3.4m
- Term
- 3 years
- Submit via
- EU-Supply (CTM)public page
- Published
- #04c74e
- Planned · expected · not yet published
Supply of 18F-prostate-specific membrane antigen (PSMA)
University Hospitals Sussex NHS Foundation Trust · NHS & health · South East England
Enquiry to establish market availability of 18F-PSMA for PET-CT service in NHS setting. University Hospitals Sussex NHS Foundation Trust seeks to establish all licensed manufacturers, and confirmation of current & future capacity to supply.…
- Value
- £660k
- Term
- Not published
- Submit via
- portal not identified
- Published
- #04c2ca
- Planned · expected · not yet published
ASTRIA
United Kingdom Atomic Energy Authority · South East England
UKAEA are looking to build a Centre of Excellence in Isotope Separation systems, pulling expertise from around the world to enable the creation of a technical development pathway. This would allow the partners to model a fuel cycle for any …
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #04b73c
- Planned · expected · not yet published
THAILA GLOVEBOXES
United Kingdom Atomic Energy Authority · South East England
UKAEA would like to procure the design, analysis, manufacture, assembly, Factory Acceptance Testing, delivery, Site Acceptance Testing plus support during installation and commissioning of a glovebox experiment designed to prove out tritium…
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #04b6cd
- Closed Restricted procedure
H3AT ADS
United Kingdom Atomic Energy Authority · South East England
The Supply of an ADS equipment package to be supplied into the Hydrogen-3 Advanced Technology Facility at UKAEA’s Culham Campus. The scope of work is expected to be delivered, installed, and commissioned within an estimated duration of 36 m…
- Value
- £3.0m
- Term
- 3 months
- Submit via
- EU-Supply (CTM)public page
- Published
- #04b1ad
- Planned · expected · not yet published
Early Legacy 3m3 Boxes
Sellafield Limited · North West England
This Prior Information Notice (PIN), without call for competition, is to alert the market and all interested Suppliers to a Contract Opportunity which will be conducted through the Dynamic Purchasing System (DPS) and to seek engagement in r…
- Value
- £5.0m
- Term
- Not published
- Submit via
- portal not identified
- Published
- #049871
- AwardedOpen procedure
Waste Characterisation
United Kingdom Atomic Energy Authority · South East England
The specification is to cover waste characterisation needs at UKAEA for radiological and non-radiological analytes to support disposal of solid, aqueous and non-aqueous waste streams.
Awarded to Amentum Clean Energy Ltd
- Value
- £2.0m
- Term
- 2 years
- Submit via
- EU-Supply (CTM)public page
- Published
- #03c87e
- AwardedRestricted procedure
Mox Fuel Line
NATIONAL NUCLEAR LABORATORY LIMITED · North West England
The current Fuel Line located in National Nuclear Laboratory's (NNL's) Central Laboratory was designed and installed in the mid-2000's in Area 400 to provide research and development (R&D) support to Sellafield Mixed Oxide (MOx) Plant (SMP)…
Awarded to Orano Limited
- Value
- £30m
- Term
- Not published
- Submit via
- EU-Supply (CTM)public page
- Published
- #0301f0
- Planned · expected · not yet published
Pu Ceramics PhD Projects- Research Hub
Nuclear Decommissioning Authority · Nationwide (UK)
The NDA will fund a Research Hub, <br/>which will be either a single university or <br/>small consortium of universities, to<br/>undertake ~4 new PhD projects each <br/>year for 5 years, with continuous support <br/>from ~2 full time Postdo…
- Value
- £6.0m
- Term
- Not published
- Submit via
- portal not identified
- Published
- #047062
- Planned · expected · not yet published
H3AT - Water Detritiation System
United Kingdom Atomic Energy Authority · South East England
The purpose of the WDS is to capture tritium from a larger volume of tritiated water into a small volume of hydrogen gas which is transferred to the Isotope Separation System for separation. Other hydrogen isotopes are discharged to atmosph…
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #04694a
- Planned · expected · not yet published
H3AT Atmosphere Detritiation System
United Kingdom Atomic Energy Authority · South East England
UKAEA are looking for partner organisations to deliver the ADS for the H3AT project as an in-kind contribution. UKAEA wishes to engage with potential prime contractors, SMEs, system designers and manufacturers of equipment for the Atmospher…
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #045860
- Closed Restricted procedure
H3AT Tritium Plant SDS Getter Beds
United Kingdom Atomic Energy Authority · South East England
The United Kingdom Atomic Energy Authority (UKAEA) requires 7-off Depleted Uranium Getter Beds to be supplied into the Hydrogen 3 Advanced Technology facility at the Culham Campus. This includes design, manufacture, assembly, Factory Accept…
- Value
- £1.2m
- Term
- 23 months
- Submit via
- EU-Supply (CTM)public page
- Published
- #0452fb
- AwardedRestricted procedure4 lots
High Integrity Stainless Steel Containers - HISSC
Sellafield Limited · North West England
The four (4) Awarded Contracts are for the manufacture, testing, inspection and delivery of High Integrity Stainless Steel Containers (HISSC) to Sellafield Ltd. HISSC is a portfolio of specialised nuclear waste container products made from …
Awarded to CW Fletcher, Graham Engineering Limited · 4 awards
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #044577
- Closed NegotiatedFramework
The procurement of a single supplier framework for the provision of scientific, manufacturing and research equipment, and consumables
AWE PLC · South East England
AWE is looking to appoint a single supplier under a framework to provide the broad range of scientific goods outlined in this contract notice, as required by AWE. The contract duration will be for 4 (four) years, with 3 (three) additional 1…
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #044402
- Planned · expected · not yet published
Regulatory Transport Safety Case Services
International Nuclear Services Limited · Nationwide (UK)
Prior Information Notification and Request for Information relating to the forthcoming procurement opportunity for a new Dynamic Purchasing System (DPS) for Transport Safety Case Services.
- Value
- £500k
- Term
- Not published
- Submit via
- portal not identified
- Published
- #0438d8
- Planned · expected · not yet published
Extraction and analysis of materials post deuterium-tritium operation in JET (1)
United Kingdom Atomic Energy Authority · South East England
The purpose of this PIN / RFI is to enable the UKAEA to assess industry and wider partner interest in sponsoring/collaborating in the extraction and analysis of JET materials exposed to deuterium-tritium plasma with a view to providing equi…
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #042b0c
- AwardedOpen procedureFramework2 lots
Framework for the supply of Radiopharmaceuticals and Related Consumables - 2023
HealthTrust Europe LLP (HTE) acting on behalf of Mid and South Essex NHS Foundation ("Authority"). · NHS & health · Nationwide (UK)
HealthTrust Europe (HTE) is seeking to establish a multi-Lot framework agreement for the supply of Radiopharmaceuticals, which are sterile and non-sterile radioactive drugs used in nuclear medicine procedures to diagnose, monitor, and treat…
Awarded to ALLIANCE MEDICAL RADIOPHARMACY LIMITED, Curium Pharma, GE Healthcare +1 more · 6 awards
- Value
- £100mceiling, not a contract size
- Term
- 2 years
- Submit via
- Jaggaerlogin required
- Published
- #03cfab
- AwardedAward procedure without prior publication of a call for competitionFramework
MOX FUEL LINE Objective 1 - Re-use in LWR type reactors – MOx pellet manufacture Objective 2 - Disposal/immobilisation - manufacturing “disposal-grade” MOx pellets for disposal within a Geological
Nuclear Decommissioning Authority · Nationwide (UK)
Fuel line scientific studies, research and development, materials archive, technology demonstrations, trials and engineering studies, establishing new capabilities (design, construction, and installation of equipment), operation of NDA Grou…
Awarded to National Nuclear Laboratory
- Value
- Not published
- Term
- Not published
- Submit via
- portal not identified
- Published
- #04172a
- AwardedOpen procedureFramework3 lots
Radiopharmaceuticals and Related Consumables
Leeds and York Partnership NHS Foundation Trust · NHS & health · Nationwide (UK)
NHS North of England Commercial Procurement Collaborative on behalf of NHS Procurement in Partnership (Comprising of East of England NHS Collaborative Procurement hub, NHS Commercial Solutions, NHS London Procurement partnership and NHS Nor…
Awarded to Advanced Accelerator Applications (UK and Ireland) Ltd, Curium Pharma, GE Healthcare +1 more · 9 awards
- Value
- £60mceiling, not a contract size
- Term
- 4 years
- Submit via
- Atamis legacy domain (health-family.force.com)login required
- Published
- #0392d0