Hacker News
new
|
past
|
comments
|
ask
|
show
|
jobs
|
submit
login
ars
on Sept 4, 2015
|
parent
|
context
|
favorite
| on:
The Mystery of Devil's Kettle Falls
Iodine-123 maybe, but you'd have to make it on the spot.
The half-life is 13.22 hours, and it makes some detectable gamma rays.
Consider applying for YC's Summer 2026 batch! Applications are open till May 4
Guidelines
|
FAQ
|
Lists
|
API
|
Security
|
Legal
|
Apply to YC
|
Contact
Search:
The half-life is 13.22 hours, and it makes some detectable gamma rays.