Cannabis irradiation is the use of ionising radiation to reduce bacteria, yeasts and moulds on harvested flower so it passes microbial limits. The main methods are gamma rays (usually from cobalt-60), electron beam (e-beam) and X-ray. Other decontamination methods include ozone, radio-frequency heating and UV, which are not ionising radiation. Irradiation does not make the flower radioactive.
In practice
Some regulated markets allow irradiation of cannabis, and it is widely used in some medical supply chains; others restrict it. Whether it must be disclosed on the label varies, so consumers often cannot tell. Studies report modest changes: cannabinoid content largely unchanged, with some loss of monoterpenes reported (Hazekamp 2016)being reviewed. Irradiation does not remove mycotoxins or pesticide residues already present, and it can mask poor drying or hygiene that caused the contamination.
GenetixBay's view: growing your own, where legal, is the surest way to know your flower was dried well rather than rescued by decontamination. Prevention (clean rooms, airflow, a proper dry) beats a kill step.
Rules differ by country, state, province and city, and change often. This is a general definition, not legal advice: check local rules.
Don't confuse with
- UV treatment: non-ionising, mainly surface-acting.
- Pasteurisation: heat-based, a different process.
A cannabinoid is any compound that binds the body's cannabinoid receptors or shares the typical cannabis terpenophenolic structure; the plant-made ones are phytocannabinoids such as THCA and CBDA.A monoterpene is a ten-carbon terpene made from geranyl pyrophosphate, such as myrcene, limonene, pinene or terpinolene; they are the most volatile terpenes and the first lost in drying.Mycotoxins are toxic compounds made by certain moulds, such as aflatoxins and ochratoxin A from Aspergillus and Penicillium species; cannabis labs test for them at parts-per-billion levels.Pest and disease prevention by changing how the crop is grown, such as humidity, airflow, spacing, watering and cultivar choice, so pests and pathogens struggle to establish.Compliance testing is mandatory lab analysis of cannabis or hemp for potency (often total THC) and contaminants, required before sale or to prove legal status.Labelling requirements are the legal rules on what cannabis packages must and must not show, such as potency, warnings, lot number and dates.A licensed producer is a business authorised by a regulator to grow, process or sell cannabis commercially, subject to security, tracking, testing and labelling rules.Terpenes are volatile hydrocarbon compounds built from five-carbon isoprene units; in cannabis they are made in the trichome heads and are a major part of aroma and flavour.Botrytis cinerea, the fungus behind bud rot or grey mould, which rots dense colas from the inside in cool, humid conditions late in flower.
