v3.26.3
Cover
 12 Months Ended
Jun. 30, 2026
shares
Document Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Financial Statement Error Correction [Flag] false
Document Shell Company Report false
Entity Interactive Data Current Yes
Document Accounting Standard International Financial Reporting Standards
Amendment Flag false
Document Period End Date Jun. 30, 2026
Document Fiscal Year Focus 2026
Document Fiscal Period Focus FY
ICFR Auditor Attestation Flag false
Entity Registrant Name Radiopharm Theranostics Limited
Entity Central Index Key 0001949257
Current Fiscal Year End Date --06-30
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Filer Category Non-accelerated Filer
Entity File Number 001-41621
Entity Shell Company false
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity Incorporation, State or Country Code C3
Entity Address, Address Line One Level 3
Entity Address, Address Line Two 62 Lygon Street
Entity Address, City or Town Carlton VIC
Entity Address, Country AU
Entity Address, Postal Zip Code 3053
Trading Symbol RADX
Entity Common Stock, Shares Outstanding 3,544,216,160
Title of 12(b) Security Ordinary Shares, as represented by American Depositary Shares
Security Exchange Name NASDAQ
Business Contact  
Document Information [Line Items]  
Entity Address, Address Line One Level 3
Entity Address, Address Line Two 62 Lygon Street
Entity Address, City or Town Carlton VIC
Entity Address, Country AU
Entity Address, Postal Zip Code 3053
City Area Code +61
Local Phone Number 3 9824 5254
Contact Personnel Name Riccardo Canevari
Contact Personnel Email Address rc@radiopharmtheranostics.com