# half-value thickness

> thickness of an attenuating layer which reduces the value of a quantity to half of its initial value

**Wikidata**: [Q127526](https://www.wikidata.org/wiki/Q127526)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Half-value_layer)  
**Source**: https://4ort.xyz/entity/half-value-thickness


## References

1. Freebase Data Dumps. 2013
2. ISO 80000-10:2019 Quantities and units — Part 10: Atomic and nuclear physics
3. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)